JP2006247801A - Working method of worm gear - Google Patents

Working method of worm gear Download PDF

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JP2006247801A
JP2006247801A JP2005070112A JP2005070112A JP2006247801A JP 2006247801 A JP2006247801 A JP 2006247801A JP 2005070112 A JP2005070112 A JP 2005070112A JP 2005070112 A JP2005070112 A JP 2005070112A JP 2006247801 A JP2006247801 A JP 2006247801A
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shape
worm gear
worm
tooth surface
trapezoidal
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Japanese (ja)
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Hiroki Mizuno
浩樹 水野
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NSK Ltd
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NSK Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a working method of a worm gear capable of obtaining an involute shape that roughness of a tooth flank is enhanced and enhancing engagement accuracy of a worm gear. <P>SOLUTION: In the working method of the worm gear 2, a tool of wheel shape having a grinding tool 1 having a cross section of trapezoid shape on an outer peripheral part is used. In a blade part 1a of the trapezoidal grinding tool 1, the respective tooth flanks 2a, 2b of the worm gear 2 is grinding-worked to the involute shape by using the grinding tool 1 in which correction working that it is made to an inner recession shape by slightly making its blade tip and a blade base thick is applied to the existing grinding tool of trapezoid shape. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、電動パワーステアリング装置等に使用されるウォームギヤの加工方法に関するものである。   The present invention relates to a method for processing a worm gear used in an electric power steering device or the like.

ウォームギヤの仕上げ加工法としては、台形形状の砥石による研削加工が一般的である。この加工方法は、図4に示すように、ウォームギヤ2(以後、ウォーム2と言う)の回転中心軸Oに直交する直線である砥石旋回軸Pに対してリード角α°傾けた台形砥石10によりウォーム2を加工する。   As a method for finishing the worm gear, grinding with a trapezoidal grindstone is generally used. As shown in FIG. 4, this processing method uses a trapezoidal grindstone 10 inclined by a lead angle α ° with respect to a grindstone turning axis P that is a straight line perpendicular to the rotation center axis O of the worm gear 2 (hereinafter referred to as worm 2). The worm 2 is processed.

また、図5に示すように、ウォーム2の中心軸線Oを含む平面に対して所定距離平行移動して配置した台形の第1片刃バイト8aにより第1歯面2aと歯底2cの一部を切削し、ついで前記平面から反対方向に所定距離平行移動して配置した台形の第2片刃バイト8bにより第2歯面2bと歯底2cの残りを切削するという方法もある。   Further, as shown in FIG. 5, the first tooth surface 2a and part of the tooth bottom 2c are moved by a trapezoidal first single-blade tool 8a which is arranged to be translated by a predetermined distance with respect to a plane including the central axis O of the worm 2. There is also a method in which the second tooth surface 2b and the rest of the tooth bottom 2c are cut with a trapezoidal second single-blade tool 8b which is cut and then translated by a predetermined distance in the opposite direction from the plane.

この方法で形成された各歯面2a,2bと、中心軸線Oと直交する面との交差曲線は、同図に示すように、半径が上記所定距離の円9を基礎円とするインボリュート曲線9aとなり、各歯面2a,2bは凸状曲面に形成されるので、この凸状曲面をインボリュート形状と呼んでいる。インボリュート形状の歯面2a,2bは、多少の加工誤差や組み立て誤差があってもウォームホイール(図示しない)との噛み合いが悪くなることはなく、一般的に言って、噛み合い精度は向上するという利点がある。   As shown in the figure, the intersecting curve of each tooth surface 2a, 2b formed by this method and the surface orthogonal to the central axis O is an involute curve 9a whose radius is the circle 9 having the predetermined distance. Since each tooth surface 2a, 2b is formed in a convex curved surface, this convex curved surface is called an involute shape. The involute tooth surfaces 2a and 2b do not deteriorate the engagement with the worm wheel (not shown) even if there is a slight processing error or assembly error, and generally speaking, the advantage is that the engagement accuracy is improved. There is.

上述した台形砥石10で加工する方法(図4参照)の場合、形成されたウォーム2の歯面2a,2bは、図6に示すように、軸方向断面形状において破線で示すように、インボリュート形状3に比べると平坦な形状(若しくは歯先や歯元が厚い中凹形状)となり、ウォームホイールとの噛み合い精度に影響するという問題点があった。   In the case of the method of processing with the trapezoidal grindstone 10 described above (see FIG. 4), the tooth surfaces 2a and 2b of the formed worm 2 are involute shapes as shown by broken lines in the axial sectional shape as shown in FIG. 3 has a flat shape (or a concave shape with a thick tooth tip or tooth root), which affects the meshing accuracy with the worm wheel.

このインボリュート形状を得る方法としては、例えば、特許文献1においては、エンドミル形の工具を用いて、その先端部の加工面をウォームの第1歯面(又は第2歯面)に当てた状態で、先端部を回転させつつ、ウォームの回転速度と比例する速度で工具をウォームの中心軸線と平行に移動させていく方式が開示されている。
特開2001−198730号公報 特開平08−155749号公報
As a method for obtaining this involute shape, for example, in Patent Document 1, an end mill type tool is used and the processing surface at the tip is applied to the first tooth surface (or the second tooth surface) of the worm. A method is disclosed in which the tool is moved in parallel with the central axis of the worm at a speed proportional to the rotational speed of the worm while rotating the tip portion.
JP 2001-198730 A Japanese Patent Application Laid-Open No. 08-1555749

しかしながら、従来の上記ウォームギヤの加工方法(特許文献1)においては、エンドミル形の工具による加工なので、歯面の粗さを向上させるのは難しく、仕上げ加工には不向きであるという問題点があった。   However, the conventional worm gear machining method (Patent Document 1) has a problem that it is difficult to improve the roughness of the tooth surface because it is an end mill type tool and is not suitable for finishing. .

また、特許文献2においては、外周部に、歯車等の歯面をインボリュート形状に成形可能な中凹形状の刃面が形成され、その表面にCBN砥粒層が形成されたホイール形状の総形工具が示されているが、この中凹形状の刃面を有する刃部を作製するための、より簡単な方法が求められるところであった。   Moreover, in patent document 2, the overall shape of the wheel shape by which the concave surface which can shape | mold a tooth surface, such as a gearwheel, in an involute shape was formed in the outer peripheral part, and the CBN abrasive grain layer was formed in the surface. Although a tool is shown, there has been a need for a simpler method for producing a blade portion having this concavely shaped blade surface.

そこで、本発明は、上述した従来の不都合を改善して、歯面の粗さが向上したインボリュート形状が得られて、ウォームギヤの噛み合い精度を向上させることができるウォームギヤの加工方法を提供することを課題としている。   Accordingly, the present invention provides a worm gear machining method that improves the conventional inconveniences described above, obtains an involute shape with improved tooth surface roughness, and improves the meshing accuracy of the worm gear. It is an issue.

上記課題を達成するために、本発明では、外周部に断面が台形形状の砥石を有するホイール形状の工具を用いてウォームギヤの各歯面を研削加工するウォームギヤの加工方法において、前記台形形状の砥石に、その刃先部及び刃元部をやや厚くして中凹形状にする修正加工を施し、これを用いて前記ウォームギヤの各歯面をインボリュート形状に研削加工することを特徴としている。   In order to achieve the above object, according to the present invention, in the worm gear processing method for grinding each tooth surface of the worm gear using a wheel-shaped tool having a trapezoidal grinding wheel in the outer peripheral portion, the trapezoidal grinding stone Further, the cutting edge portion and the cutting edge portion are slightly thickened so as to have a concave shape, and each tooth surface of the worm gear is ground into an involute shape by using this.

本発明は、以上のような方法を用いており、既存の台形砥石に修正加工を施すことによって、比較的簡単にインボリュート形状の歯面を形成可能な台形砥石を得ることができる。このように、台形砥石を用いた研削加工なので、ウォームの歯面の粗さを向上させることができると共に、この歯面がインボリュート形状に成形されるため、ウォームとウォームホイールの噛み合い精度を向上させることができる。これに伴って、ウォームの噛み合い誤差に起因する騒音や面圧上昇、偏磨耗等を防止することができる。   The present invention uses the above-described method, and a trapezoidal grindstone capable of forming an involute-shaped tooth surface relatively easily can be obtained by subjecting an existing trapezoidal grindstone to correction processing. Thus, the grinding process using the trapezoidal grindstone can improve the roughness of the tooth surface of the worm, and the tooth surface is formed into an involute shape, thereby improving the meshing accuracy between the worm and the worm wheel. be able to. Along with this, it is possible to prevent noise, increase in surface pressure, uneven wear, and the like due to worm engagement errors.

以下、本発明の実施形態について図面を参照して説明する。   Embodiments of the present invention will be described below with reference to the drawings.

図1は本発明に関わる実施形態を示す砥石の斜視図、図2は図1の砥石の加工された刃面を示す断面図、図3はウォームギヤの加工された歯面形状を示す断面図である。   1 is a perspective view of a grindstone showing an embodiment according to the present invention, FIG. 2 is a cross-sectional view showing a processed blade surface of the grindstone of FIG. 1, and FIG. 3 is a cross-sectional view showing a tooth surface shape of a worm gear processed. is there.

本発明の加工方法で用いる台形砥石は、図1に示すように、ホイール形状で、刃部1aをウォームの歯面にあてて(図4参照)、軸1bを中心にして回転させることにより加工を行うものである。   As shown in FIG. 1, the trapezoidal grindstone used in the machining method of the present invention has a wheel shape, and the blade portion 1a is applied to the tooth surface of the worm (see FIG. 4) and is rotated by rotating around the shaft 1b. Is to do.

図2に示すように、台形砥石1の刃部1aは、その軸方向の断面形状において、破線で示す元の形状に修正加工を加え、刃先部及び刃元部をやや厚くした中凹形状に成形している。この砥石1の形状は、成形するドレッサーの形状を修正することにより、既存の台形砥石に修正加工を施すことにより得ることができる。   As shown in FIG. 2, the blade portion 1a of the trapezoidal grindstone 1 is modified to the original shape indicated by the broken line in the axial cross-sectional shape, and the blade tip portion and the blade base portion are formed in a middle concave shape with a slightly thicker shape. Molding. The shape of the grindstone 1 can be obtained by modifying the existing trapezoidal grindstone by modifying the shape of the dresser to be molded.

この台形砥石1を用いてウォーム(図示しない)を加工すると、図3に示すように、ウォームの歯面2a,2bをインボリュート形状に成形することができる。従来の台形砥石を用いて加工した場合は、背景技術の図6に示したように、破線で示すウォームの第1歯面2aと第2歯面2bはインボリュート形状3に比べて、略平坦な形状となっている。これに対して、本実施形態の砥石1を用いて加工すると、図3に示すように、ウォームの第1歯面2aと第2歯面2bは凸状曲面に成形されて、インボリュート形状3と略重なる形になっていることが分かる。同図において、2cは歯底である。   When a worm (not shown) is processed using the trapezoidal grindstone 1, the tooth surfaces 2a and 2b of the worm can be formed into an involute shape as shown in FIG. When processing using a conventional trapezoidal grindstone, as shown in FIG. 6 of the background art, the first tooth surface 2a and the second tooth surface 2b of the worm indicated by the broken line are substantially flat compared to the involute shape 3. It has a shape. In contrast, when the grindstone 1 of the present embodiment is used, the first tooth surface 2a and the second tooth surface 2b of the worm are formed into convex curved surfaces as shown in FIG. It can be seen that they are almost overlapping. In the same figure, 2c is a tooth bottom.

以上のように、本発明においては、ドレッサーの形状を修正して、既存の台形砥石に修正加工を施すことによって、比較的簡単にインボリュート形状3の歯面を形成可能な台形砥石1を得ることができる。このように、ホイール形状の台形砥石1を用いた研削加工なので、ウォームの歯面の粗さを向上させることができると共に、この歯面がインボリュート形状3になっているため、ウォームとウォームホイールの噛み合い精度を向上させることができる。これに伴って、噛み合い誤差に起因する騒音や面圧上昇、偏磨耗等を防止することができる。   As described above, in the present invention, the trapezoidal grindstone 1 capable of forming the tooth surface of the involute shape 3 relatively easily is obtained by modifying the shape of the dresser and performing the modification process on the existing trapezoidal grindstone. Can do. Thus, since the grinding process is performed using the wheel-shaped trapezoidal grindstone 1, the roughness of the tooth surface of the worm can be improved, and the tooth surface has the involute shape 3, so that the worm and the worm wheel can be improved. The meshing accuracy can be improved. Along with this, it is possible to prevent noise, an increase in surface pressure, uneven wear, and the like due to meshing errors.

本発明に関わる実施形態を示す砥石の斜視図である。It is a perspective view of a grindstone showing an embodiment concerning the present invention. 図1の砥石の加工された刃面形状を示す断面図である。It is sectional drawing which shows the blade surface shape by which the grindstone of FIG. 1 was processed. ウォームギヤの加工された歯面形状を示す断面図である。It is sectional drawing which shows the tooth surface shape by which the worm gear was processed. 従来のウォームギヤの研削加工を示す斜視模式図である。It is a perspective schematic diagram which shows the grinding process of the conventional worm gear. 従来のインボリュート形状を得る研削加工方法を示す説明図である。It is explanatory drawing which shows the grinding method of obtaining the conventional involute shape. 従来のウォームギヤの加工された歯面形状を示す断面図である。It is sectional drawing which shows the tooth surface shape by which the conventional worm gear was processed.

符号の説明Explanation of symbols

1:砥石
2:ウォームギヤ
2a:第1歯面
2b:第2歯面
3:インボリュート形状
1: Grinding wheel 2: Worm gear 2a: First tooth surface 2b: Second tooth surface 3: Involute shape

Claims (1)

外周部に断面が台形形状の砥石を有するホイール形状の工具を用いてウォームギヤの各歯面を研削加工するウォームギヤの加工方法において、
前記台形形状の砥石に、その刃先部及び刃元部をやや厚くして中凹形状にする修正加工を施し、これを用いて前記ウォームギヤの各歯面をインボリュート形状に研削加工することを特徴とするウォームギヤの加工方法。
In the processing method of the worm gear that grinds each tooth surface of the worm gear using a wheel-shaped tool having a trapezoidal grinding wheel in the outer periphery,
The trapezoidal grindstone is subjected to a modification process to make the blade edge part and the blade edge part slightly thick to make a concave shape, and using this, each tooth surface of the worm gear is ground into an involute shape, How to process the worm gear.
JP2005070112A 2005-03-11 2005-03-11 Working method of worm gear Withdrawn JP2006247801A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107876902A (en) * 2017-11-24 2018-04-06 上海合纵重工机械有限公司 A kind of processing method for matching enveloping worm

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107876902A (en) * 2017-11-24 2018-04-06 上海合纵重工机械有限公司 A kind of processing method for matching enveloping worm

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