JP3142752B2 - Shaft fixing structure - Google Patents
Shaft fixing structureInfo
- Publication number
- JP3142752B2 JP3142752B2 JP07241712A JP24171295A JP3142752B2 JP 3142752 B2 JP3142752 B2 JP 3142752B2 JP 07241712 A JP07241712 A JP 07241712A JP 24171295 A JP24171295 A JP 24171295A JP 3142752 B2 JP3142752 B2 JP 3142752B2
- Authority
- JP
- Japan
- Prior art keywords
- shaft
- male screw
- nut
- spacer ring
- peripheral surface
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Landscapes
- Measuring Fluid Pressure (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、衝撃による応力
集中から生じる軸部の破損を有効に防止して強固な固定
を可能とする軸部の固定構造に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shaft fixing structure capable of effectively preventing damage to the shaft caused by stress concentration due to impact and enabling firm fixing.
【０００２】[0002]
【従来の技術】図２は従来の軸部の固定構造を示す部分
断面図であり、図において、１１は雌ネジ部１２ａの形
成されたネジ穴１２を有するボディ、１３は差圧・圧力
伝送器等の指示計のハウジングであり、アルミダイカス
トとして形成されている。１４はボディ１１のネジ穴１
２にねじ込まれる雄ネジ部１４ａを外周面に形成した軸
部であり、ハウジング１３と一体に形成されている。１
５は軸部１４の雄ネジ部１４ａにねじ込み可能な雌ネジ
部１５ａを有したナットである。なお、１４ｂは軸部１
４の固定後にナット１５とハウジング１３との間に雄ネ
ジ部１４ａが露出する雄ネジ露出部である。2. Description of the Related Art FIG. 2 is a partial sectional view showing a conventional shaft fixing structure. In FIG. 2, reference numeral 11 denotes a body having a screw hole 12 formed with a female screw portion 12a, and reference numeral 13 denotes a differential pressure / pressure transmission. It is a housing of an indicator such as a container, and is formed as an aluminum die-cast. 14 is a screw hole 1 of the body 11
2 is a shaft portion formed on the outer peripheral surface with a male screw portion 14 a screwed into the housing 2, and is formed integrally with the housing 13. 1
Reference numeral 5 denotes a nut having a female screw portion 15a which can be screwed into the male screw portion 14a of the shaft portion 14. 14b is the shaft 1
This is a male screw exposed portion where the male screw portion 14a is exposed between the nut 15 and the housing 13 after the fixing of the screw 4.
【０００３】次に動作について説明する。軸部１４の雄
ネジ部１４ａの終端部付近にナット１５を予めねじ込ん
でおく。次に、軸部１４の雄ネジ部１４ａをボディ１１
のネジ穴１２に所定量ねじ込む。最後にナット１５をボ
ディ１１に当接するように回していくことによって、い
わゆるダブルナット方式でハウジング１３の軸部１４が
ボディ１１に固定される。Next, the operation will be described. A nut 15 is screwed in advance near the end of the male screw portion 14a of the shaft portion 14. Next, the male screw part 14a of the shaft part 14 is
Into a screw hole 12 of a predetermined amount. Finally, by rotating the nut 15 so as to be in contact with the body 11, the shaft portion 14 of the housing 13 is fixed to the body 11 by a so-called double nut method.
【０００４】なお、このようにしてボディ１１に固定さ
れたハウジング１３の軸部１４に対して、重量物の落下
による衝撃耐久試験等が行われる。これは実際のアプリ
ケーションにおいて、落石（曲げ・衝撃荷重）などによ
る局部的な応力集中に対する軸部１４の耐久性を確認す
るためのものである。[0004] The shaft portion 14 of the housing 13 fixed to the body 11 in this way is subjected to an impact durability test or the like due to the drop of a heavy object. This is to confirm the durability of the shaft portion 14 against local stress concentration due to falling rocks (bending / impact load) in an actual application.
【０００５】一方、他の従来の軸部の固定構造として、
特開平６−３３７０１２号公報や特開昭６１−２０１９
１２号公報に開示されているいわゆるダブルナット方式
によるものも提供されている。On the other hand, as another conventional shaft fixing structure,
JP-A-6-337012 and JP-A-61-2019
A so-called double-nut type disclosed in Japanese Patent Publication No. 12 is also provided.
【０００６】[0006]
【発明が解決しようとする課題】従来の軸部の固定構造
は以上のように構成されているので、上記衝撃耐久試験
等において、雄ネジ露出部１４ｂの谷部近傍に、該山部
との若干の寸法差により局部的な応力集中が生じて、該
部分の亀裂・破断が起こりやすいという課題があった。Since the conventional structure for fixing the shaft portion is constructed as described above, in the above-mentioned impact durability test or the like, the vicinity of the valley portion of the exposed portion 14b of the male screw is formed with the ridge portion. There is a problem that local stress concentration occurs due to a slight dimensional difference, and cracks and breaks in the portion are likely to occur.
【０００７】また、特開平６−３３７０１２号公報や特
開昭６１−２０１９１２号公報に開示されている従来の
軸部の固定構造にあっては、ダブルナット方式によって
単に軸部の固定の緩みを防止するものであり、局部的な
応力集中による軸部の亀裂・破断に対しては必ずしも有
効に対処できないという課題があった。Further, in the conventional shaft fixing structure disclosed in JP-A-6-337012 and JP-A-61-201912, the loosening of the shaft is simply reduced by the double nut method. There is a problem that cracks and breaks in the shaft portion due to local stress concentration cannot always be effectively dealt with.
【０００８】この発明は上記のような課題を解決するた
めになされたもので、応力集中による軸部の亀裂・破断
を防止して強固な固定を可能とする軸部の固定構造を得
ることを目的とする。SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a shaft fixing structure which can prevent the shaft from cracking or breaking due to stress concentration and can firmly fix the shaft. Aim.
【０００９】[0009]
【課題を解決するための手段】この請求項１記載の軸部
の固定構造は、雌ネジ部の形成された固定基台と、該固
定基台の雌ネジ部にねじ込まれる雄ネジ部と該雄ネジ部
の終端部付近から反先端部側に外径が拡大するテーパ部
を形成した軸部と、内周面を前記テーパ部とはめ合うテ
ーパ状に形成するとともに外周面を雄ネジ部として形成
したスペーサリングと、該スペーサリングの雄ネジ部が
ねじ込まれる雌ネジ部を内周面に有し一端面を前記固定
基台に当接可能に形成したナットとを備えて構成したも
のである。According to a first aspect of the present invention, there is provided a shaft fixing structure, comprising: a fixing base formed with a female thread; a male thread to be screwed into the female thread of the fixing base; A shaft portion having a tapered portion whose outer diameter increases from the vicinity of the end of the male screw portion to the opposite end portion side, and an inner peripheral surface formed into a tapered shape to be fitted with the tapered portion, and an outer peripheral surface as a male screw portion A spacer ring formed, and a nut having a female screw portion on the inner peripheral surface into which the male screw portion of the spacer ring is screwed, and having one end surface formed to be able to abut the fixed base. .
【００１０】[0010]
【発明の実施の形態】以下、この発明の実施の一形態を
説明する。 実施の形態１．図１において、１は雌ネジ部２ａの形成
されたネジ穴２を有するボディ（固定基台）、３は差圧
・圧力伝送器等の指示計のハウジングであり、アルミダ
イカストとして形成されている。４はボディ１の雌ネジ
部２ａにねじ込まれる雄ネジ部４ａを先端部付近に形成
するとともに、雄ネジ部４ａの終端部付近から反先端部
側に外径が拡大するテーパ部４ｂを形成した軸部、５は
全体形状をリング状に形成しそのリング内周面をテーパ
部４ｂとはめ合うテーパ状に形成するとともに、リング
外周面を雄ネジ部５ａとして形成したスペーサリングで
あり、非脆性材料にて形成されている。６はスペーサリ
ング５の雄ネジ部５ａがねじ込まれる雌ネジ部６ａを内
周面に有し、反ハウジング３側の端面をボディ１に当接
可能に形成したナットであり、これも非脆性材料にて形
成されている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below. Embodiment 1 FIG. In FIG. 1, reference numeral 1 denotes a body (fixed base) having a screw hole 2 in which a female screw portion 2a is formed, and 3 denotes a housing of an indicator such as a differential pressure / pressure transmitter, which is formed as an aluminum die-cast. . Reference numeral 4 denotes a male screw 4a screwed into the female screw 2a of the body 1 formed near the distal end, and a tapered portion 4b whose outer diameter increases from the vicinity of the end of the male screw 4a to the distal end. The shaft portion 5 is a spacer ring whose entire shape is formed in a ring shape, the inner peripheral surface of the ring is formed in a tapered shape to be fitted with the tapered portion 4b, and the outer peripheral surface of the ring is formed as a male screw portion 5a. It is formed of a material. Numeral 6 is a nut having an internal thread 6a into which the male thread 5a of the spacer ring 5 is screwed, and formed so that the end face on the side opposite to the housing 3 can be brought into contact with the body 1, which is also a non-brittle material. Is formed.
【００１１】次に動作について説明する。予め軸部４の
テーパ部４ｂにスペーサリング５をはめ込んでおき、さ
らにそのスペーサリング５の雄ネジ部５ａにナット６の
雌ネジ部６ａをねじ込んでおく。そして次に、軸部４の
雄ネジ部４ａをボディ１のネジ穴２の雌ネジ部２ａに所
定量ねじ込む。最後にナット６をボディ１に当接する方
向に回して締めていくことによって、スペーサリング５
が、テーパ部４ｂの径が拡大する方向に移動していき、
スペーサリング５とテーパ部４ｂとのはめ合わせによる
摩擦力が強くなっていく。すなわち、軸部４のテーパ部
４ｂとスペーサリング５とが上記摩擦力によって一体化
することにより、従来のいわゆるダブルナット方式と同
様の効果をもって、ハウジング３の軸部４がボディ１に
強固に固定される。また軸部４は、局部的な応力集中の
起こりやすい雄ネジ部の露出を回避できるため、該露出
部分の谷部を起点としての軸部４の亀裂・破断を防止で
きる。なお、ナット６の固定後にもスペーサリング５の
雄ネジ部５ａに露出部分が生じるが、該露出部分の雄ネ
ジ部５ａの谷径はテーパ部４ｂの外径よりも大きくなっ
ており、局部的な応力集中が起こりにくく、耐衝撃性は
向上する。Next, the operation will be described. The spacer ring 5 is fitted into the tapered portion 4b of the shaft portion 4 in advance, and the female screw portion 6a of the nut 6 is further screwed into the male screw portion 5a of the spacer ring 5. Then, the male screw 4a of the shaft 4 is screwed into the female screw 2a of the screw hole 2 of the body 1 by a predetermined amount. Finally, by turning the nut 6 in the direction in which it comes into contact with the body 1 and tightening it, the spacer ring 5
Moves in the direction in which the diameter of the tapered portion 4b increases,
The frictional force due to the engagement between the spacer ring 5 and the tapered portion 4b increases. That is, since the tapered portion 4b of the shaft portion 4 and the spacer ring 5 are integrated by the frictional force, the shaft portion 4 of the housing 3 is firmly fixed to the body 1 with the same effect as the conventional so-called double nut system. Is done. In addition, since the shaft portion 4 can avoid exposing the male screw portion where local stress concentration is likely to occur, the shaft portion 4 can be prevented from being cracked or broken starting from the valley portion of the exposed portion. Although an exposed portion is formed in the external thread portion 5a of the spacer ring 5 even after the nut 6 is fixed, the root diameter of the external thread portion 5a in the exposed portion is larger than the outer diameter of the tapered portion 4b, and the exposed portion is locally formed. Stress concentration hardly occurs, and the impact resistance is improved.
【００１２】この発明は以上のように構成されているた
め、応力集中による軸部の亀裂・破断を防止して強固な
固定を可能とする軸部の固定構造を得ることができる。
なお、上記各ネジ部の向きは左右いずれかに限定され
ず、またハウジング３は差圧・圧力伝送器以外の指示計
等のものであってももちろんよい。[0012] Since the present invention is configured as described above, it is possible to obtain a shaft fixing structure capable of firmly fixing the shaft by preventing the shaft from cracking or breaking due to stress concentration.
The direction of each of the screw portions is not limited to left or right, and the housing 3 may be of an indicator other than the differential pressure / pressure transmitter.
【００１３】[0013]
【発明の効果】以上のように、請求項１の発明によれ
ば、雌ネジ部の形成された固定基台と、該固定基台の雌
ネジ部にねじ込まれる雄ネジ部と該雄ネジ部の終端部付
近から反先端部側に外径が拡大するテーパ部を形成した
軸部と、内周面を前記テーパ部とはめ合うテーパ状に形
成するとともに外周面を雄ネジ部として形成したスペー
サリングと、該スペーサリングの雄ネジ部がねじ込まれ
る雌ネジ部を内周面に有し一端面を前記固定基台に当接
可能に形成したナットとを備えて構成したので、応力集
中による軸部の亀裂・破断を防止して強固な固定を可能
とする軸部の固定構造を得ることができるという効果が
ある。As described above, according to the first aspect of the present invention, the fixed base having the female screw portion formed therein, the male screw portion screwed into the female screw portion of the fixed base, and the male screw portion are formed. A shaft portion having a tapered portion whose outer diameter increases from the vicinity of the terminal end to the opposite end portion side, and a spacer having an inner peripheral surface formed in a tapered shape to be fitted with the tapered portion and an outer peripheral surface formed as a male screw portion. A ring and a nut having an internal thread on the inner peripheral surface into which a male thread of the spacer ring is screwed, and one end face of which is formed to be able to abut on the fixed base. There is an effect that it is possible to obtain a fixing structure of the shaft portion that prevents the portion from being cracked or broken, thereby enabling strong fixing.
【図１】この発明の実施の一形態による軸部の固定構造
を示す部分断面図である。FIG. 1 is a partial sectional view showing a fixing structure of a shaft according to an embodiment of the present invention.
【図２】従来の軸部の固定構造を示す部分断面図であ
る。FIG. 2 is a partial cross-sectional view showing a conventional shaft portion fixing structure.
１ ボディ（固定基台） ２ ネジ穴 ２ａ 雌ネジ部 ３ ハウジング ４ 軸部 ４ａ 雄ネジ部 ４ｂ テーパ部 ５ スペーサリング ５ａ 雄ネジ部 ６ ナット ６ａ 雌ネジ部 DESCRIPTION OF SYMBOLS 1 Body (fixed base) 2 Screw hole 2a Female screw part 3 Housing 4 Shaft part 4a Male screw part 4b Taper part 5 Spacer ring 5a Male screw part 6 Nut 6a Female screw part
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) G01L 19/00 F16B 39/12 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. 7 , DB name) G01L 19/00 F16B 39/12
Claims (1)
定基台の雌ネジ部にねじ込まれる雄ネジ部を先端部付近
に形成するとともに該雄ネジ部の終端部付近から反先端
部側に外径が拡大するテーパ部を形成した軸部と、全体
形状をリング状に形成しそのリング内周面を前記テーパ
部とはめ合うテーパ状に形成するとともにリング外周面
を雄ネジ部として形成したスペーサリングと、該スペー
サリングの雄ネジ部がねじ込まれる雌ネジ部を内周面に
有し一端面を前記固定基台に当接可能に形成したナット
とを備えた軸部の固定構造。1. A fixing base having a female screw portion formed therein, and a male screw portion to be screwed into the female screw portion of the fixing base formed near a distal end portion, and a distal end portion near a terminal end portion of the male screw portion. A shaft portion having a tapered portion whose outer diameter increases on the side of the portion, and a ring-shaped overall shape, the inner peripheral surface of which is formed in a tapered shape to be fitted with the tapered portion, and the outer peripheral surface of the ring is a male screw portion. Of a shaft part comprising: a spacer ring formed as a nut; and a nut formed on an inner peripheral surface of the spacer ring with a female screw part into which a male screw part of the spacer ring is screwed, and having one end surface formed to be able to abut the fixing base. Construction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07241712A JP3142752B2 (en) | 1995-09-20 | 1995-09-20 | Shaft fixing structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07241712A JP3142752B2 (en) | 1995-09-20 | 1995-09-20 | Shaft fixing structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0988930A JPH0988930A (en) | 1997-03-31 |
| JP3142752B2 true JP3142752B2 (en) | 2001-03-07 |
Family
ID=17078419
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP07241712A Expired - Lifetime JP3142752B2 (en) | 1995-09-20 | 1995-09-20 | Shaft fixing structure |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3142752B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100448567B1 (en) * | 2002-06-25 | 2004-09-13 | 금호타이어 주식회사 | A shaft fastening device |
-
1995
- 1995-09-20 JP JP07241712A patent/JP3142752B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0988930A (en) | 1997-03-31 |
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