JPH05104448A - Grinding wheel - Google Patents

Abstract

PURPOSE:To level the wear of the whole of a grindstone by, in the grindstone to grind the curved face of an orifice coupling for the differential limitting device or the like of a vehicle establishing the rate of distribution of an abrasive grain to peripheral length in a radial direction so as to become larger as the diameter of the grindstone becomes larger and smaller as it becomes smaller. CONSTITUTION:A grindstone A used for grinding the cam face (c) of the housing H of a orifice coupling is formed into a cloverlike shape, and has a sectional shape formed by combining two circular arcs having a radius R and mutually offset centers. Abrasive grains (s) on the surface of the grindstone A form abrasive grain distribution 2 where the abrasive grains are distributed at uniform density and a part 3 where the abrasive grain is not distributed and has no grindstone (s). The part 3 is formed by masking a corresponding part at the time of coating the abrasive grain (s). The rate of the part 2 to the part 3 is established so that the ratio of b/a may be constant in the case where length to be ground in a section in each radial direction of the cam face C is denoted by (a), and peripheral length on which the part 2 does not exist in the section in a radial direction is denoted by (b). Thus, the larger a large diametral part having a great amount of grinding work becomes in its diameter, the larger the rate of the abrasive grain (s) becomes, and the rate of wear is thereby made uniform.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明は、車両の差動制限装置や
駆動力配分装置に適用されるオリフィスカップリングの
ドライブハウジング等、中心をオフセットさせた異なる
Ｒの組み合せからなる断面をもつ加工物の曲面を研削加
工するのに用いる砥石に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a workpiece having a cross section composed of a combination of different Rs with offset centers, such as a drive housing of an orifice coupling applied to a vehicle differential limiting device or a driving force distribution device. The present invention relates to a grindstone used to grind a curved surface of.

【０００２】[0002]

【従来の技術】従来、中心が異なる複数の円弧を有した
断面形状に形成された加工物として、例えば、『自動車
工学・1991 年５月号』（株式会社鉄道日本社発行）の５
７頁に記載されたオリフィスカップリングが知られてい
る。この従来出典のオリフィスカップリングには、ピス
トンの頭部が当接するカム面を有したハウジングが示さ
れていて、このカム面は、中心をオフセットさせた２つ
の円弧を組み合せた断面形状となっている。2. Description of the Related Art Conventionally, as a work piece formed in a cross-sectional shape having a plurality of arcs having different centers, for example, "Automotive Engineering May 1991" (published by The Railway Japan Co., Ltd.)
Orifice couplings described on page 7 are known. In this conventional orifice coupling, a housing having a cam surface with which the head of a piston abuts is shown, and this cam surface has a sectional shape in which two arcs whose centers are offset are combined. There is.

【０００３】ところで、このような形状のカム面を研削
する際には、全体にわたってカム面の断面形状と同じ断
面形状（総形状）の砥石を、この研削面に当てて加工し
ている。By the way, when grinding a cam surface having such a shape, a grindstone having the same cross-sectional shape (total shape) as the cross-sectional shape of the cam surface is applied to the entire grinding surface.

【０００４】[0004]

【発明が解決しようとする課題】しかしながら、上記従
来の砥石による研削加工によれば、砥石の中央付近の大
径部分と端部の小径部分とでは、前者の方が回転中心か
らの距離が遠くて仕事量が多いため、このような加工品
を量産する場合、砥石の中心の大径部分が偏摩耗して、
砥石の表面形状が変化し、研削形状が崩れてしまうとい
う問題があった。ちなみに、図６は、これを説明する図
であって、ａ’はカム面の研削長を示し、ｂ’は砥石の
周長を示している。このように、両者は一定の比例関係
にないために、砥石にあっては、Ｓに示すような摩耗が
生じるもので、すなわち、中央部分の摩耗量が大きく端
部の摩耗量が小さくなる。However, according to the conventional grinding process using the above-mentioned grindstone, the former has a larger distance from the center of rotation between the large-diameter portion near the center of the grindstone and the smaller-diameter portion at the end. Therefore, when mass-producing such processed products, the large diameter part of the center of the grindstone wears unevenly,
There has been a problem that the surface shape of the grindstone changes and the grinding shape collapses. By the way, FIG. 6 is a diagram for explaining this, in which a'represents the grinding length of the cam surface and b'represents the circumferential length of the grindstone. As described above, since the two are not in a fixed proportional relationship, the grindstone causes wear as shown by S, that is, the amount of wear in the central portion is large and the amount of wear in the end portion is small.

【０００５】本発明は、上記のような問題に着目してな
されたもので、総形状の砥石の摩耗を平均化することを
課題とする。The present invention has been made in view of the above problems, and it is an object of the present invention to average the wear of the grindstones of all shapes.

【０００６】[0006]

【課題を解決するための手段】上記課題を解決するため
本発明の砥石では、砥石の周長に対する砥粒の分布割合
を、大径部分ほど大きく、小径部分ほど小さくなるよう
にした。In order to solve the above problems, in the grindstone of the present invention, the distribution ratio of the abrasive grains to the circumference of the grindstone is set such that the larger diameter portion is larger and the smaller diameter portion is smaller.

【０００７】すなわち、中心が異なる複数の円弧を有し
た断面形状に形成された加工物の研削面と同じ断面形状
に形成され、表面に砥粒が設けられている砥石におい
て、ラジアル方向の周長に対する前記砥粒の分布割合
を、大径部分ほど大きく、小径部分ほど小さくした。That is, in a grindstone formed in the same cross-sectional shape as the ground surface of a workpiece formed in a cross-sectional shape having a plurality of arcs with different centers and provided with abrasive grains on the surface, the circumferential length in the radial direction is The distribution ratio of the above-mentioned abrasive grains to the larger diameter portion was made larger and the smaller diameter portion was made smaller.

【０００８】なお、砥粒をこのような分布割合とするに
あたり、砥粒を設ける密度を、大径部分ほど密にすると
共に、小径部分ほど粗としてもよいし（請求項２）、ま
た、砥石の表面に、大径部分側ほど狭く小径部分側ほど
広い非砥粒分布部を形成してもよい（請求項３）。When the abrasive grains are made to have such a distribution ratio, the density at which the abrasive grains are provided may be made higher in the larger diameter portion and coarser in the smaller diameter portion (claim 2), or the grindstone. A non-abrasive grain distribution portion that is narrower on the large diameter portion side and wider on the smaller diameter portion side may be formed on the surface of (3).

【０００９】[0009]

【作用】研削を行った時には、砥石の大径部分は仕事量
が多くなり小径部分は仕事量が少なくなる。それに対し
て、砥石の周長に対して砥粒が設けられている割合は、
大径部分ほど大きく小径部分ほど小さくなっている。し
たがって、砥粒の１個当りの仕事量が平均化されて砥粒
の摩耗度合が均一化する。When the grinding is performed, the large-diameter portion of the grindstone has a large amount of work, and the small-diameter portion has a small amount of work. On the other hand, the ratio of abrasive grains to the circumference of the grindstone is
The larger diameter part is larger and the smaller diameter part is smaller. Therefore, the work amount of each abrasive grain is averaged and the degree of wear of the abrasive grains is made uniform.

【００１０】よって、砥石全体の摩耗度合も均一化し、
加工物を量産する場合でも、安定した加工物の断面形状
が得られる。また、砥粒を全体にわたって使い切ること
ができる。Therefore, the degree of wear of the whole grindstone is made uniform,
A stable cross-sectional shape of the workpiece can be obtained even when the workpiece is mass-produced. Further, the abrasive grains can be used up entirely.

【００１１】[0011]

【実施例】以下、本発明の実施例を図面に基づいて説明
する。まず、構成を説明する。Embodiments of the present invention will be described below with reference to the drawings. First, the configuration will be described.

【００１２】図１は請求項３記載の発明に対応した例で
ある本発明第１実施例の砥石Ａを示す正面図，図２は第
１実施例の砥石Ａによる研削状態を示す断面図，図３は
図２のＸ−Ｘ断面図である。FIG. 1 is a front view showing a grindstone A of a first embodiment of the present invention, which is an example corresponding to the invention of claim 3, and FIG. 2 is a sectional view showing a grinding state by the grindstone A of the first embodiment. FIG. 3 is a sectional view taken along line XX of FIG.

【００１３】第１実施例の砥石Ａは、オリフィスカップ
リングのハウジングＨのカム面Ｃの研削に用いるもの
で、このカム面Ｃは、図３に示すようにクローバのよう
な形状に形成されていると共に、図２に示すように、中
心をオフセットさせた半径Ｒの２つの円弧を組み合せた
断面形状に形成されている。The grindstone A of the first embodiment is used for grinding the cam surface C of the housing H of the orifice coupling, and the cam surface C is formed in a shape like a crowbar as shown in FIG. In addition, as shown in FIG. 2, it is formed in a cross-sectional shape in which two arcs having a radius R of which the center is offset are combined.

【００１４】一方、前記砥石Ａも、図１，２に示すよう
に、断面形状が前記カム面Ｃの断面形状と同じ形状（総
形状）に形成されている。なお、１は砥石を回転させる
駆動軸である。On the other hand, as shown in FIGS. 1 and 2, the grindstone A is also formed to have the same sectional shape (total shape) as the sectional shape of the cam surface C. In addition, 1 is a drive shaft for rotating the grindstone.

【００１５】また、前記砥石Ａの表面には、砥粒ｓが設
けられている。すなわち、図１に示すように、砥石Ａの
表面には、砥粒ｓが一様の密度で分布している砥粒分布
部２と、砥粒ｓが全く設けられていない非砥粒分布部３
とが形成されている。この非砥粒分布部３は、例えば、
砥石Ａの台金に非砥粒分布部３の形状のマスキングを施
しておいて、台金表面に砥粒ｓをメッキすることで形成
したり、また、台金の表面に非砥粒分布部３の形状の凹
部を形成した後、台金をマスキング液に浸漬させ、その
後、台金の表面を磨いた上で、砥粒ｓをメッキする等の
方法により形成することができる。Further, abrasive grains s are provided on the surface of the grindstone A. That is, as shown in FIG. 1, on the surface of the grindstone A, the abrasive grain distribution portion 2 in which the abrasive grains s are distributed at a uniform density and the non-abrasive grain distribution portion in which the abrasive grains s are not provided at all. Three
And are formed. The non-abrasive grain distribution portion 3 is, for example,
The base metal of the grindstone A may be formed by masking the shape of the non-abrasive grain distribution part 3 and then plating the surface of the base metal with the abrasive grains s, or the non-abrasive grain distribution part on the surface of the base metal. After forming the concave portion having the shape of 3, the base metal may be dipped in a masking liquid, and then the surface of the base metal may be polished and then the abrasive grains s may be plated.

【００１６】そして、砥粒分布部２と非砥粒分布部３と
の割合は、カム面Ｃの各ラジアル方向断面における研削
長をａとし、砥石Ａの各ラジアル方向断面において砥粒
分布部２が存在している部分の周方向長をｂとした時に
（図３参照）、各位置においてｂ／ａが一定となるよう
に設定している。The ratio of the abrasive grain distribution portion 2 to the non-abrasive grain distribution portion 3 is defined as a grinding length in each radial cross section of the cam surface C, and the abrasive grain distribution portion 2 in each radial cross section of the grindstone A. It is set so that b / a is constant at each position, where b is the circumferential length of the portion in which is present (see FIG. 3).

【００１７】次に、作用を説明する。Next, the operation will be described.

【００１８】実施例の砥石Ａによりカム面Ｃを研削する
際には、図４に示すように、砥石Ａを回転させながら、
駆動軸１をカム面Ｃと一定距離を保たせながら、ｍで示
す軌跡で移動させる。この研削時にあっては、砥石Ａで
は、ラジアル方向の径差に基づき、大径部分の仕事量が
多くなり小径部分の仕事量が少なくなる。When grinding the cam surface C with the grindstone A of the embodiment, as shown in FIG. 4, while rotating the grindstone A,
The drive shaft 1 is moved along a locus indicated by m while keeping a constant distance from the cam surface C. At the time of this grinding, the grindstone A has a large amount of work in the large diameter portion and a small amount of work in the small diameter portion based on the radial difference in the radial direction.

【００１９】それに対して、砥石Ａの表面に非砥粒分布
部３を設けて、周長に対する砥粒ｓの割合を、仕事量の
多い大径部分ほど大きくする一方、仕事量の少ない小径
部分ほど小さくしているため、砥粒ｓの一個一個では、
各砥粒ｓ当りの仕事量が平均化されて砥粒ｓの摩耗度合
が均一化する。On the other hand, by providing the non-abrasive grain distribution portion 3 on the surface of the grindstone A, the ratio of the abrasive grains s to the circumference is increased in the large diameter portion having a large amount of work, while the small diameter portion having a small amount of work is formed. Since it is so small, each abrasive grain s
The work amount for each abrasive grain s is averaged, and the degree of wear of the abrasive grain s is made uniform.

【００２０】したがって、砥石Ａ全体の摩耗度合が均一
化し、ハウジングＨを量産するにあたり、カム面Ｃの形
状が安定するという効果が得られる。Therefore, the degree of wear of the entire grindstone A becomes uniform, and the effect of stabilizing the shape of the cam surface C can be obtained when the housing H is mass-produced.

【００２１】さらに、この効果により、砥石Ａを長く使
用できるようになりコストダウンを図ることができると
いう効果が得られ、同時に、砥粒ｓを全体にわたって使
い切ることができ、砥粒ｓの無駄を省いてコストダウン
を図ることができるという効果も得られる。Further, by this effect, the grindstone A can be used for a long time and the cost can be reduced, and at the same time, the abrasive grains s can be used up as a whole, and the abrasive grains s are wasted. There is also an effect that the cost can be reduced by omitting it.

【００２２】次に、図５に示す請求項２記載の発明に対
応した本発明第２実施例について説明する。なお、この
第２実施例を説明するにあたり、第１実施例との相違点
のみを説明することにし、第１実施例と同じ構成につい
ては第１実施例と同じ符号を付けて説明を省略する。Next, a second embodiment of the present invention corresponding to the invention of claim 2 shown in FIG. 5 will be described. In describing the second embodiment, only the differences from the first embodiment will be described, the same components as those in the first embodiment will be designated by the same reference numerals as those in the first embodiment, and description thereof will be omitted. .

【００２３】この第２実施例の砥石Ｂは、砥粒ｓを設け
る密度を、大径部分ほど密にすると共に、小径部分ほど
粗にしている。すなわち、図示のように、砥石Ｂの表面
を大径領域５ａ，中径領域５ｂ，小径領域５ｃに３分割
し、大径領域５ａでは砥粒ｓを最も密に設け、中径領域
５ｂでは、砥粒ｓをそれよりも粗に設け、小径領域５ｃ
では、砥粒ｓをさらに粗に設けている。In the grindstone B of the second embodiment, the density at which the abrasive grains s are provided is higher in the larger diameter portion and is coarser in the smaller diameter portion. That is, as shown in the figure, the surface of the grindstone B is divided into three large-diameter regions 5a, medium-diameter regions 5b, and small-diameter regions 5c. The large-diameter regions 5a are provided with the densest abrasive grains s, and the medium-diameter regions 5b are The abrasive grains s are provided coarser than that, and the small diameter region 5c
Then, the abrasive grains s are provided more coarsely.

【００２４】すなわち、この実施例の場合、各領域５
ａ，５ｂ，５ｃの中央位置に存在する砥粒ｓの数と、こ
の位置に対応したカム面Ｃの長さとが一定の関係になる
ように設定している。That is, in the case of this embodiment, each region 5
The number of abrasive grains s existing at the central positions of a, 5b, 5c and the length of the cam surface C corresponding to this position are set to have a fixed relationship.

【００２５】したがって、この実施例にあっても、砥粒
ｓの一個一個の仕事量が平均化されることになって、砥
石Ｂ全体の摩耗度合が均一化してカム面Ｃの形状が安定
するという効果、および、砥粒ｓの無駄を省いてコスト
ダウンを図ることができるという効果が得られる。Therefore, also in this embodiment, the work of each of the abrasive grains s is averaged, the wear degree of the entire grindstone B is made uniform, and the shape of the cam surface C is stabilized. And the effect that the cost can be reduced by eliminating the waste of the abrasive grains s.

【００２６】以上、実施例を図面により説明してきた
が、具体的な構成は実施例に限られるものではなく、本
発明の要旨を逸脱しない範囲における変更や追加等があ
っても本発明に含まれる。Although the embodiments have been described above with reference to the drawings, the specific configuration is not limited to the embodiments, and modifications and additions within the scope of the present invention are included in the present invention. Be done.

【００２７】例えば、実施例では、加工物の研削面とし
て２つの円弧を組み合せた形状のカム面を示したが、３
以上の円弧を組み合せた形状に形成してもよい。For example, in the embodiment, a cam surface having a shape in which two arcs are combined is shown as the grinding surface of the work, but 3
You may form in the shape which combined the above-mentioned circular arcs.

【００２８】また、第２実施例では、砥粒ｓの分布密度
を異ならせた領域を３種類形成した例を示したが、もっ
と細分化させてもよい。Further, in the second embodiment, an example in which three types of regions having different distribution densities of abrasive grains s are formed, but they may be subdivided.

【００２９】[0029]

【発明の効果】以上説明してきたように本発明の砥石に
あっては、研削面の周長に対する砥粒の分布割合を、大
径部分ほど大きく、小径部分ほど小さくなるようにした
構成としたため、研削時には、砥粒の一個当りの仕事量
が平均化されて砥粒の摩耗度合が均一化し、このため、
砥石全体の摩耗度合が均一化して、加工物を量産する場
合でも、安定した加工物の断面形状が得られるという効
果を奏するし、また、砥粒を全体にわたって使い切るこ
とができて、コストダウンを図ることができるという効
果を奏する。As described above, in the grindstone of the present invention, the distribution ratio of the abrasive grains to the peripheral length of the grinding surface is set to be larger in the large diameter portion and smaller in the smaller diameter portion. During grinding, the work amount per abrasive grain is averaged and the degree of wear of the abrasive grains is made uniform.
The degree of wear of the whole grindstone is uniform, and even when mass-producing workpieces, a stable cross-sectional shape of the workpiece can be obtained, and the abrasive grains can be used up throughout, reducing costs. The effect that it can be achieved is produced.

【図面の簡単な説明】[Brief description of drawings]

【図１】本発明第１実施例の砥石を示す正面図である。FIG. 1 is a front view showing a grindstone according to a first embodiment of the present invention.

【図２】本発明第１実施例の砥石Ａによる研削状態を示
す断面図である。FIG. 2 is a cross-sectional view showing a grinding state with a grindstone A according to a first embodiment of the present invention.

【図３】図２のＸ−Ｘ断面図である。FIG. 3 is a sectional view taken along line XX of FIG.

【図４】本発明第１実施例の砥石の研削状態を示す説明
図である。FIG. 4 is an explanatory view showing a grinding state of the grindstone of the first embodiment of the present invention.

【図５】本発明第２実施例の砥石をを示す正面図であ
る。FIG. 5 is a front view showing a grindstone of a second embodiment of the present invention.

【図６】従来技術を説明するためのグラフである。FIG. 6 is a graph for explaining a conventional technique.

【符号の説明】[Explanation of symbols]

Ａ 砥石 Ｃ カム面（研削面） Ｈ ハウジング（加工物） ｓ 砥粒 ２ 砥粒分布部 ３ 非砥粒分布部 A Grindstone C Cam surface (ground surface) H Housing (workpiece) s Abrasive grain 2 Abrasive grain distribution part 3 Non-abrasive grain distribution part

Claims (3)

【特許請求の範囲】[Claims] 【請求項１】 中心が異なる複数の円弧を有した断面形
状に形成された加工物の研削面と同じ断面形状に形成さ
れ、表面に砥粒が設けられている砥石において、 ラジアル方向の周長に対する前記砥粒の分布割合を、大
径部分ほど大きく、小径部分ほど小さくしたことを特徴
とする砥石。1. A grindstone formed in the same cross-sectional shape as a ground surface of a workpiece formed in a cross-sectional shape having a plurality of arcs having different centers, and provided with abrasive grains on the surface, the circumferential length in the radial direction. A grindstone characterized in that the distribution ratio of the above-mentioned abrasive grains to the larger diameter portion is larger and the smaller diameter portion is smaller. 【請求項２】 請求項１記載の砥石において、前記砥粒
を設ける密度を、大径部分ほど密にすると共に、小径部
分ほど粗とすることで、前記周長に対する砥粒の分布割
合を、大径部分ほど大きく、小径部分ほど小さくなるよ
う分布させたことを特徴とする砥石。2. The grindstone according to claim 1, wherein the density at which the abrasive grains are provided is made higher in the large diameter portion and made coarser in the smaller diameter portion, so that the distribution ratio of the abrasive grains to the peripheral length is A grindstone characterized by being distributed so that the larger diameter portion is larger and the smaller diameter portion is smaller. 【請求項３】 請求項１記載の砥石において、前記砥石
の表面に、大径部分側ほど狭く小径部分側ほど広い非砥
粒分布部を形成して、前記周長に対する砥粒の分布割合
を、大径部分ほど大きく、小径部分ほど小さくなるよう
分布させたことを特徴とする砥石。3. The grindstone according to claim 1, wherein a non-abrasive distribution portion is formed on the surface of the grindstone so that the larger diameter portion side is narrower and the smaller diameter portion side is wider. A grindstone characterized by being distributed so that the larger diameter portion is larger and the smaller diameter portion is smaller.