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JP5022254B2 - Axis stop structure for machine parts - Google Patents
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JP5022254B2 - Axis stop structure for machine parts - Google Patents

Axis stop structure for machine parts Download PDF

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JP5022254B2
JP5022254B2 JP2008022406A JP2008022406A JP5022254B2 JP 5022254 B2 JP5022254 B2 JP 5022254B2 JP 2008022406 A JP2008022406 A JP 2008022406A JP 2008022406 A JP2008022406 A JP 2008022406A JP 5022254 B2 JP5022254 B2 JP 5022254B2
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screw
arc
insertion hole
hole
rotating shaft
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JP2009180364A (en
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義守 杉田
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Ichinen Manufacturing Co Ltd
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Asama Seisakusho Co Ltd
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Description

本発明は、種々の機械装置において回転軸に機械部品を抜け出し不能に固定するための機械部品の軸止め構造に関するものである。   TECHNICAL FIELD The present invention relates to a shaft stopping structure for a machine part for fixing the machine part to a rotating shaft so as not to be pulled out in various machine devices.

回転軸に歯車やカム等の機械部品を取り付ける機械部品の軸止め構造として、図16〜18に示すように回転軸1の一部に平坦外側面15を設けて断面D形としたいわゆるDカット部11を形成したものが知られている。このものにおいては、歯車2等の機械部品にはボス部3を設けて、このボス部3にDカット部11に対応するD形状の挿通孔31を形成して、Dカット部11をこの挿通孔31に嵌入することによって回転軸1と機械部品との回転方向の位置決めを行うことができる。   A so-called D-cut having a flat outer surface 15 provided on a part of the rotary shaft 1 and having a D-shaped cross section as shown in FIGS. What formed the part 11 is known. In this device, a mechanical part such as the gear 2 is provided with a boss portion 3, a D-shaped insertion hole 31 corresponding to the D-cut portion 11 is formed in the boss portion 3, and the D-cut portion 11 is inserted into the insertion portion 31. By inserting into the hole 31, the rotation shaft 1 and the machine part can be positioned in the rotation direction.

図16〜18に示したものにおいては、機械部品の回転軸1からの抜け出しを防止するための手段として、ボス部3に、Dカット部11の平坦外側面15に向けて垂直方向にネジ穴32を設け、このネジ穴32にネジ33を螺入して回転軸1を締め付ける軸止め構造が採用されている(特許文献1)。また、図19、20に示す軸止め構造においては、回転軸1の端部に環状の嵌挿溝12を設け、この嵌挿溝12にE型止め輪13を嵌め込むことにより回転軸1と歯車2等の機械部品とを固定するようにしたものである(特許文献2)。
特開平6−66297号公報 実開平6−15688号公報
16 to 18, as means for preventing the mechanical parts from coming out of the rotating shaft 1, screw holes are formed in the boss portion 3 in the vertical direction toward the flat outer surface 15 of the D-cut portion 11. A shaft locking structure is employed in which a screw 32 is provided and a screw 33 is screwed into the screw hole 32 to fasten the rotary shaft 1 (Patent Document 1). 19 and 20, an annular fitting groove 12 is provided at the end of the rotating shaft 1, and an E-type retaining ring 13 is fitted into the fitting groove 12 so that the rotating shaft 1 and The mechanical parts such as the gear 2 are fixed (Patent Document 2).
JP-A-6-66297 Japanese Utility Model Publication No. 6-15688

しかしながら、ネジ33を使用した軸止め構造においては、ボス部3にネジ螺入用の穴32が必要となるため機械部品の成形金型にスライド部が必要となり、成形後に後加工としてネジ螺入用の孔32にタッピング加工を施さねばならない。また、組み付け時にはネジ33を締めるためのラジアル方向からの作業が必要となる。また、ボス部3の分だけ機械部品のスラスト方向の長さが長くなるといった問題があった。さらに、ネジ先端が尖っていたような場合には、Dカット部11による回転力保持が十分行えず回転時にがたつきが発生するという問題があった。   However, in the shaft retaining structure using the screw 33, the screw portion 32 is required in the boss portion 3, and therefore a slide portion is required in the molding die of the machine part. The hole 32 for use must be tapped. Moreover, the work from the radial direction for tightening the screw 33 is required at the time of assembly. In addition, there is a problem that the length of the mechanical part in the thrust direction is increased by the boss portion 3. Furthermore, when the tip of the screw is sharp, there is a problem that the rotational force cannot be sufficiently held by the D-cut portion 11 and rattling occurs during rotation.

また、E型止め輪13を使用した軸止め構造においては、回転軸1に嵌挿溝12を設けるための後加工を要し、組み付け時にはE型止め輪13を嵌めるためのラジアル方向からの作業を行う必要があった。さらに、Dカット部11は挿通孔31に差し込まれているだけであって、Dカット部11は挿通孔31の平坦内側面15方向に押圧されてはいないので、回転時に歯車2等ががたつくという問題があった。   Further, in the shaft retaining structure using the E-type retaining ring 13, post-processing for providing the insertion groove 12 in the rotating shaft 1 is required, and work from the radial direction for fitting the E-shaped retaining ring 13 during assembly. Had to do. Furthermore, since the D-cut portion 11 is only inserted into the insertion hole 31 and the D-cut portion 11 is not pressed in the direction of the flat inner surface 15 of the insertion hole 31, the gear 2 and the like are rattled during rotation. There was a problem.

本発明は、上記した従来の問題点に鑑み、製造や締め付けが容易で、回転時にがたつきが生ずることがない機械部品の軸止め構造を提供するためになされたものである。   SUMMARY OF THE INVENTION The present invention has been made in view of the above-described conventional problems, and is intended to provide a shaft stopper structure for a machine part that is easy to manufacture and tighten and that does not rattle during rotation.

上記の課題を解決するためになされた本発明に係る機械部品のネジ止め構造は、端部に平坦外側面と円弧外側面とを有するDカット部を設けた回転軸を、平坦内側面と円弧内側面とを有するD字状の挿通孔に嵌入して固定する機械部品の軸止め構造において、
前記円弧内側面に平行に、入口部が挿通孔に連通するネジの螺入孔を設けて、この螺入孔にねじ込まれたネジの頭部により回転軸の円弧外側面を押圧して、機械部品を回転軸に抜け出し不能に固定することを特徴とするものである。
In order to solve the above-described problems, the screwing structure for a machine part according to the present invention includes a rotating shaft provided with a D-cut portion having a flat outer surface and an arc outer surface at an end, a flat inner surface and an arc. In the shaft stopping structure of a machine part that is fitted and fixed in a D-shaped insertion hole having an inner surface,
In parallel with the inner surface of the arc, a screw threaded hole is provided in which the inlet portion communicates with the insertion hole, and the outer surface of the arc of the rotating shaft is pressed by the head of the screw screwed into the screw hole. The component is fixed to the rotating shaft so as not to be pulled out.

請求項1に係る発明は、ネジの頭部がDカット部円弧外側面を押圧するので、機械部品を回転軸に抜け出し不能に固定することができる。 In the invention according to claim 1, since the head of the screw presses the outer surface of the D-cut portion arc, the machine part can be fixed to the rotating shaft so as not to be pulled out.

以下に、本発明の実施形態及び参考形態について説明する。
図1、2は、本発明の第1の参考形態の機械部品の軸止め構造を示す図であって、1は回転軸、2は歯車、4はクランク部材である。回転軸1は軸受け部材5に支持されており、この回転軸1の両端に歯車2とクランク部材4が固定されている。以下に、機械部品として歯車2を例に本発明の軸止め構造を説明する。
Hereinafter, embodiments and reference embodiments of the present invention will be described.
Figure 2 is a first diagram showing the axial stop structure of the machine parts reference embodiment of the present invention, 1 is the rotation axis, 2 gears, 4 is a crank member. The rotating shaft 1 is supported by a bearing member 5, and a gear 2 and a crank member 4 are fixed to both ends of the rotating shaft 1. The shaft locking structure of the present invention will be described below using the gear 2 as an example of a mechanical part.

回転軸1は端部にDカット部11を有する。Dカット部11は平坦外側面15と円弧外側面16とを有する。歯車2の中心にはDカット部11に対応したD字状の挿通孔31が形成されている。挿通孔31は、平坦内側面35と円弧内側面36とを有する。Dカット部11を挿通孔31に差し込むことによって、歯車2の取付角度を固定することができる。   The rotating shaft 1 has a D-cut portion 11 at the end. The D-cut portion 11 has a flat outer surface 15 and an arc outer surface 16. A D-shaped insertion hole 31 corresponding to the D-cut portion 11 is formed at the center of the gear 2. The insertion hole 31 has a flat inner surface 35 and an arc inner surface 36. The insertion angle of the gear 2 can be fixed by inserting the D cut portion 11 into the insertion hole 31.

挿通孔31の平坦内側面35と反対側の円弧内側面36に平行にネジの螺入孔6が設けられている。すなわちネジの螺入孔6は平坦内側面35に対向する円弧内側面36の部位(平坦内側面35に垂直で円弧の中心を通る直線が円弧と公差する部位)に設けられている。図3に示すように螺入孔6は挿通孔31との境界が連通している。また、図4に示すように、螺入孔6は入口側が大径部62、奥部側が小径部63に形成してある。小径部63はネジ径より小径に形成してある。また、小径部63の中心軸は大径部62よりDカット部11側に寄っている。したがって、図4、5に示すように、入口側よりネジ33を奥方向に螺入することによって、小径部38にてネジ山を回転軸1のDカット部11の円弧外側面16と、螺入孔6の側面61(図においては上方側面)とに食い込ませることができる。また、ネジ山が平坦外側面15をこれに垂直の方向に押圧するので、機械部品を挿通孔31から抜け出し不能に固定することができる。   A screw insertion hole 6 is provided in parallel with the arc inner surface 36 opposite to the flat inner surface 35 of the insertion hole 31. That is, the screw screw hole 6 is provided at a portion of the arc inner surface 36 facing the flat inner surface 35 (a portion where a straight line perpendicular to the flat inner surface 35 and passing through the center of the arc has a tolerance with the arc). As shown in FIG. 3, the screw hole 6 communicates with the insertion hole 31 at the boundary. Further, as shown in FIG. 4, the screw hole 6 is formed in the large diameter portion 62 on the inlet side and in the small diameter portion 63 on the back side. The small diameter portion 63 is formed smaller than the screw diameter. Further, the central axis of the small diameter portion 63 is closer to the D cut portion 11 side than the large diameter portion 62. Therefore, as shown in FIGS. 4 and 5, by screwing the screw 33 in the back direction from the inlet side, the screw thread can be screwed at the small diameter portion 38 with the arc outer surface 16 of the D-cut portion 11 of the rotary shaft 1. It can bite into the side surface 61 (upper side surface in the figure) of the inlet hole 6. Further, since the screw thread presses the flat outer surface 15 in a direction perpendicular to the flat outer surface 15, the mechanical component can be fixed so as not to be pulled out from the insertion hole 31.

図21には、平坦内側面36に連通して平行にネジの螺入孔6を設けた実施形態のものを示す。このものにおいては、螺入孔6にねじ込まれたネジ33のネジ山をDカット部11の平坦外側面15に食い込ませることができる。また、ネジが円弧外側面16を横方向に押圧するので、歯車2を挿通孔31から抜け出し不能に固定することができる。   FIG. 21 shows an embodiment in which a screw insertion hole 6 is provided in parallel with the flat inner side surface 36. In this case, the thread of the screw 33 screwed into the screw hole 6 can be caused to bite into the flat outer surface 15 of the D-cut portion 11. Moreover, since the screw presses the arc outer surface 16 in the lateral direction, the gear 2 can be fixed so as not to come out of the insertion hole 31.

なお、Dカット部11をネジ33より軟質な材料、例えば真鍮や炭素鋼などで構成したうえに、ネジ33を焼き入れ焼き戻しや浸炭焼き入れで硬化することによって、ネジ山をDカット11部に食い込ませることができる。   The D-cut portion 11 is made of a material softer than the screw 33, such as brass or carbon steel, and the screw 33 is hardened by quenching and tempering or carburizing and quenching, so that the screw thread becomes the D-cut 11 portion. Can bite into.

図6〜7に第2の参考形態の機械部品の軸止め構造を示す。この形態のものも、前記した平坦内側面35とは反対側の円弧内側面36に平行にネジの螺入孔6を設けてある。螺入孔6は入り口側の大径部62と奥部の小径部63とからなる。Dカット部11の挿通孔31と小径部63との間には可撓性を有する薄肉部65が設けられている。そして、螺入孔6にネジ33をねじ込んでそのネジ山により薄肉部65を押圧することにより、この薄肉部65を介してDカット部11の円弧外側面16を押圧することができるので、機械部品を回転軸1に抜け出し不能に固定することができる(図9、10)。なお、この薄肉部65と螺入孔6は平坦内側面35の側に設けることもできる。 Figure 6-7 shows the axial stop structure of the machine parts of the second reference embodiment. Also in this embodiment, a screw insertion hole 6 is provided in parallel to the arc inner surface 36 opposite to the flat inner surface 35 described above. The screw hole 6 includes a large-diameter portion 62 on the entrance side and a small-diameter portion 63 on the back. A thin portion 65 having flexibility is provided between the insertion hole 31 and the small diameter portion 63 of the D cut portion 11. Since the screw 33 is screwed into the screw hole 6 and the thin portion 65 is pressed by the screw thread, the arc outer surface 16 of the D-cut portion 11 can be pressed through the thin portion 65. The component can be fixed to the rotary shaft 1 so as not to be pulled out (FIGS. 9 and 10). The thin wall portion 65 and the screw hole 6 can be provided on the flat inner surface 35 side.

次に、本発明の実施形態の機械部品の軸止め構造を、図11、12に示す。この形態のものにおいても、前記平坦内側面35とは反対側の円弧内側面36に平行に、ネジの螺入孔6が設けられている。この螺入孔6は、大径部62が挿通孔31に連通するが、小径部63は仕切部67によって隔絶されている。大径部62は図12において上部内壁68が挿通孔31の方に向けて下がっている。したがって、螺入孔6にネジを螺入することによって、図14、15に示すように、ネジ33の頭部Hにより回転軸1のDカット部11の円弧外側面16を押圧して、機械部品を回転軸1に抜け出し不能に固定することができる。なお、この螺入孔6も平坦内側面35の側に設けることもできる。 Next, FIGS. 11 and 12 show shaft stopping structures for machine parts according to the embodiment of the present invention . Also in this embodiment, screw screw holes 6 are provided in parallel with the arc inner surface 36 opposite to the flat inner surface 35. In the screw hole 6, the large-diameter portion 62 communicates with the insertion hole 31, but the small-diameter portion 63 is isolated by a partition portion 67. In the large-diameter portion 62, the upper inner wall 68 is lowered toward the insertion hole 31 in FIG. 12. Accordingly, by screwing the screw into the screw hole 6, the arc outer surface 16 of the D-cut portion 11 of the rotary shaft 1 is pressed by the head H of the screw 33 as shown in FIGS. The component can be fixed to the rotary shaft 1 so as not to be pulled out. The screw hole 6 can also be provided on the flat inner surface 35 side.

第1の参考形態の機械部品の軸止め構造を備えた機械装置の側面図である。It is a side view of the machine device provided with the axis stop structure of the machine component of the 1st reference form. 図1のA−A線断面図である。It is the sectional view on the AA line of FIG. 歯車部の側面図である。It is a side view of a gear part. 螺入孔にネジをねじ込む状態の説明図である。It is explanatory drawing of the state which screws in a screw hole. 軸止め構造の説明図である。It is explanatory drawing of a shaft stop structure. 第2の参考形態の機械部品の軸止め構造を備えた機械装置の側面図である。It is a side view of the machine apparatus provided with the axis stop structure of the machine component of the 2nd reference form. 図6のB−B線断面図である。It is the BB sectional view taken on the line of FIG. 歯車部の側面図である。It is a side view of a gear part. 螺入孔にネジをねじ込む状態の説明図である。It is explanatory drawing of the state which screws in a screw hole. 軸止め構造の説明図である。It is explanatory drawing of a shaft stop structure. 本発明の実施形態の機械部品の軸止め構造を備えた機械装置の側面図である。It is a side view of the machine device provided with the axis stop structure of the machine parts of the embodiment of the present invention . 図11のC−C線断面図である。It is CC sectional view taken on the line of FIG. 歯車部の側面図である。It is a side view of a gear part. 螺入孔にネジをねじ込む状態の説明図である。It is explanatory drawing of the state which screws in a screw hole. 軸止め構造の説明図である。It is explanatory drawing of a shaft stop structure. 従来の機械部品の軸止め構造を備えた機械装置の斜視図である。It is a perspective view of the mechanical apparatus provided with the conventional axis stop structure of machine parts. 従来の機械部品の軸止め構造を備えた機械装置の正面図である。It is a front view of the machine apparatus provided with the conventional axial stop structure of machine parts. 図17に示す装置の歯車部の側面図である。It is a side view of the gear part of the apparatus shown in FIG. E型止め輪で軸止めした機械装置の側面図である。It is a side view of the mechanical apparatus which carried out the axis stop with the E type retaining ring. 図19に示す機械装置の正面断面図である。It is front sectional drawing of the machine apparatus shown in FIG. 図5とは別の形態の軸止め構造の説明図である。It is explanatory drawing of the shaft stopper structure of a form different from FIG.

1 回転軸、6 螺入孔、11 Dカット部、15 平坦外側面、16 円弧外側面、31 挿通孔、33 ネジ、35 平坦内側面、36 円弧内側面、   DESCRIPTION OF SYMBOLS 1 Rotating shaft, 6 Screw hole, 11 D cut part, 15 Flat outer surface, 16 Arc outer surface, 31 Insertion hole, 33 Screw, 35 Flat inner surface, 36 Arc inner surface,

Claims (1)

端部に平坦外側面と円弧外側面とを有するDカット部を設けた回転軸を、平坦内側面と円弧内側面とを有するD字状の挿通孔に嵌入して固定する機械部品の軸止め構造において、Attaching a rotating shaft having a D-cut portion having a flat outer surface and an arc outer surface at the end to be fitted into a D-shaped insertion hole having a flat inner surface and an arc inner surface and fixed thereto. In structure
前記円弧内側面に平行に、入口部が挿通孔に連通するネジの螺入孔を設けて、この螺入孔にねじ込まれたネジの頭部により回転軸の円弧外側面を押圧して、機械部品を回転軸に抜け出し不能に固定することを特徴とする機械部品の軸止め構造。  In parallel with the inner surface of the arc, a screw threaded hole is provided in which the inlet portion communicates with the insertion hole, and the outer surface of the arc of the rotating shaft is pressed by the head of the screw screwed into the screw hole. A shaft stopper structure for a machine part, wherein the part is fixed to the rotating shaft so that it cannot be pulled out.
JP2008022406A 2008-02-01 2008-02-01 Axis stop structure for machine parts Expired - Fee Related JP5022254B2 (en)

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US4086946A (en) * 1976-05-07 1978-05-02 Taper Line, Incorporated Locking nut
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US5902066A (en) * 1997-07-10 1999-05-11 Lake Shore Cryotronics, Inc. Taper shaft lock
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