JP2009125847A - Cotter assembling device - Google Patents

Cotter assembling device Download PDF

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JP2009125847A
JP2009125847A JP2007302372A JP2007302372A JP2009125847A JP 2009125847 A JP2009125847 A JP 2009125847A JP 2007302372 A JP2007302372 A JP 2007302372A JP 2007302372 A JP2007302372 A JP 2007302372A JP 2009125847 A JP2009125847 A JP 2009125847A
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cotter
opening
assembling apparatus
central axis
tip
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JP4780092B2 (en
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Ichiro Horikawa
一郎 堀川
Hiroyasu Sato
寛泰 佐藤
Hiroyuki Komatsu
宏之 小松
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Toyota Motor Corp
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Toyota Motor Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a cotter assembling device capable of smoothly inserting a cotter opener to open a cotter when inserting the cotter opener to the cotter. <P>SOLUTION: In the cotter assembling device 10 provided with the cotter opener 14 for opening the cotter 40, an end of the cotter opener 14 contacts with an inner periphery of the cotter 40. The cotter assembling device 10 includes three or more first portions provided separately, and second portions arranged between the adjacent first portions, wherein length of the second portion from a side face to a central axis in a radial direction on a cross section orthogonal to the central axis of the cotter opener 14 is shorter than that of the first portion. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、コッタを開かせるためのコッタ開きを具備するコッタ組付装置に関する。   The present invention relates to a cotter assembling apparatus having a cotter opening for opening a cotter.

従来より、エンジン（内燃機関）の吸・排気バルブのバルブステムには、コッタを介してリテーナを取り付ける。バルブステムの上端にはリテーナが取り付けられ、リテーナとシリンダヘッドの間にはバルブスプリングが圧縮状態で配置される。リテーナは、円周方向に２分割された半割テーパ状のコッタを介してバルブステムの上端に取り付けられる。コッタはバルブステムに抱きつくと共に、コッタの内周面に形成された凸部をバルブステムの外周面に形成された凹部に係合させる。リテーナはコッタの外周側に嵌合され、バルブスプリングの押圧力によりバルブステムから抜けないように固定される。   Conventionally, a retainer is attached to a valve stem of an intake / exhaust valve of an engine (internal combustion engine) via a cotter. A retainer is attached to the upper end of the valve stem, and a valve spring is disposed in a compressed state between the retainer and the cylinder head. The retainer is attached to the upper end of the valve stem via a half-tapered cotter divided into two in the circumferential direction. The cotter hugs the valve stem and engages a convex portion formed on the inner peripheral surface of the cotter with a concave portion formed on the outer peripheral surface of the valve stem. The retainer is fitted on the outer peripheral side of the cotter, and is fixed so as not to come out of the valve stem by the pressing force of the valve spring.

図５は従来のコッタ組付装置による組付け方法を説明するための図である。コッタ組付装置１００は、ハウジング１１０と、コッタ押さえ１２０と、コッタ開き１３０と、センターシャフト１４０と、を備えている。従来では、図５（ａ）に示される状態から、コッタ開き１３０をコッタ４０へと挿入し、コッタ４０を左右に開かせる（図５（ｂ）及び（ｃ））。コッタ押さえ１２０でコッタ４０の姿勢を維持しながら、一旦バルブステム２０の凹部を越えて組付下降端まで下降させる（図５（ｄ）及び（ｅ））。組付装置１００を上昇させると、コッタ４０の凸部がバルブステム２０の凹部へと倣いながら入り、図５（ｆ）に示すように組付が完了する。このようなコッタ組付装置として、例えば特許文献１には、円柱状のコッタ開きを用いてコッタを組みつけられるように開くコッタ組付装置が開示されている。
特開平７−８８７３３号公報 FIG. 5 is a view for explaining an assembling method by a conventional cotter assembling apparatus. The cotter assembling apparatus 100 includes a housing 110, a cotter presser 120, a cotter opening 130, and a center shaft 140. Conventionally, from the state shown in FIG. 5A, the cotter opening 130 is inserted into the cotter 40, and the cotter 40 is opened to the left and right (FIGS. 5B and 5C). While maintaining the posture of the cotter 40 with the cotter presser 120, the cotter is once lowered over the recess of the valve stem 20 to the assembly lowering end (FIGS. 5D and 5E). When the assembling apparatus 100 is raised, the convex part of the cotter 40 enters while following the concave part of the valve stem 20, and the assembling is completed as shown in FIG. As such a cotter assembling apparatus, for example, Patent Document 1 discloses a cotter assembling apparatus that opens so that a cotter can be assembled using a cylindrical cotter opening.
JP-A-7-88733

しかしながら、従来のコッタ組付装置により組付けを実施すると、コッタ開きによりコッタを左右へと開かせる際にコッタに対向する力が発生してしまい、コッタが開かないという問題があった。   However, when assembling is performed by a conventional cotter assembling apparatus, there is a problem that when the cotter is opened to the left and right by opening the cotter, a force that faces the cotter is generated and the cotter is not opened.

図６は、従来のコッタ組付装置についての問題点を説明するための図である。図６（ａ）はコッタを示す側面図であり、図６（ｂ）は上面図である。尚、図においては説明のため、円周方向に２分割された１対のコッタ半体のうち片方のコッタ半体のみを実線で示している。図６（ａ）に示すように、コッタ開き１３０がコッタ４０へと挿入する際には、コッタ開き１３０の先端（下端）に設けられたテーパ面１３１をコッタ４０へと押し付けながらコッタ４０を開かせる。このとき、図６（ｂ）に示すように、テーパ面１３１であるコッタ開き１３０の外周面はコッタ４０の内周面に沿って当接するため、コッタ４０の半径方向に押圧力が発生する（図において、斜線部で示す部分に押圧力が発生する）。ここで、コッタがバルブの回転を容易とするフリーバルブ用のコッタ４０である場合には、コッタ４０は真円を円周方向に２分割した１対のコッタ半体からなる。このため、通常のコッタ半体の中心角が略１２０度〜１４０度であるのに対して、フリーバルブ用のコッタ４０ではコッタ半体の中心角が１８０度となる。従って、コッタ４０を開かせるために必要な方向の力（図では左右方向の力Ｆ２）以外にも、半円形状を有するコッタ半体の端部方向にも力（図では上下方向に対向する力Ｆ１及びＦ３）が発生してしまう。この上下方向に対向する力によって、コッタ４０は上下方向に突っ張ってしまい、左右方向へと開くことができない。   FIG. 6 is a diagram for explaining problems with the conventional cotter assembling apparatus. 6A is a side view showing the cotter, and FIG. 6B is a top view. In the figure, for the sake of explanation, only one cotter half of a pair of cotter halves divided in the circumferential direction is shown by a solid line. As shown in FIG. 6A, when the cotter opening 130 is inserted into the cotter 40, the cotter 40 is opened while pressing the tapered surface 131 provided at the tip (lower end) of the cotter opening 130 against the cotter 40. Make it. At this time, as shown in FIG. 6B, the outer peripheral surface of the cotter opening 130 which is the tapered surface 131 abuts along the inner peripheral surface of the cotter 40, so that a pressing force is generated in the radial direction of the cotter 40 ( In the drawing, a pressing force is generated in a portion indicated by a hatched portion). Here, when the cotter is a free valve cotter 40 that facilitates rotation of the valve, the cotter 40 is composed of a pair of cotter halves obtained by dividing a perfect circle into two in the circumferential direction. For this reason, the center angle of the normal cotter half is approximately 120 to 140 degrees, whereas in the free valve cotter 40, the center angle of the cotter half is 180 degrees. Therefore, in addition to the force in the direction necessary for opening the cotter 40 (the force F2 in the left-right direction in the figure), the force is also applied in the direction toward the end of the semicircular cotter half (in the figure, the up-down direction). Forces F1 and F3) are generated. Due to the force opposed to the vertical direction, the cotter 40 is stretched in the vertical direction and cannot be opened in the horizontal direction.

このように、従来のコッタ組付装置によれば、コッタ開きをコッタに挿入するに際してコッタを開かせることができないものであり、コッタの組付けができないという問題点があった。   As described above, according to the conventional cotter assembling apparatus, there is a problem that the cotter cannot be assembled because the cotter cannot be opened when the cotter opening is inserted into the cotter.

本発明は、かかる課題を解決するためになされたものであり、コッタ開きをコッタに挿入するに際して、スムーズにコッタを開かせて挿入することができるコッタ組付装置を提供することを目的とする。   The present invention has been made to solve such a problem, and an object of the present invention is to provide a cotter assembling apparatus that can smoothly open and insert a cotter when inserting the cotter opening into the cotter. .

本発明に係るコッタ組付装置は、コッタを開かせるコッタ開きを具備するコッタ組付装置において、前記コッタ開きの先端部が、前記コッタの内周と当接し、且つ互いに離間して３以上設けられた第１の部分と、隣接する前記第１の部分の間に配置され、前記コッタ開きの中心軸と垂直な断面における側面から前記中心軸までの径方向の長さが前記第１の部分よりも短い第２の部分と、を含むものである。   The cotter assembling apparatus according to the present invention is the cotter assembling apparatus having a cotter opening for opening the cotter, wherein the tip end portion of the cotter opening is in contact with the inner periphery of the cotter, and is provided with three or more apart from each other The first portion has a radial length from a side surface to the central axis in a cross section perpendicular to the central axis of the cotter opening, which is disposed between the first portion and the adjacent first portion. A second portion shorter than the second portion.

このようなコッタ組付装置によれば、コッタ開きをコッタに挿入するに際して、対向する力の発生を阻止してコッタが突っ張ることを防止することができるため、スムーズにコッタを開かせて挿入することができる。   According to such a cotter assembling apparatus, when inserting the cotter opening into the cotter, it is possible to prevent the cotter from being stretched by preventing generation of opposing forces, so that the cotter can be opened and inserted smoothly. be able to.

また、前記第１の部分が、前記コッタ開きの周方向に沿って均等に配されるようにしてもよい。このような構成により、少なくとも１つのコッタ開きの第１の部分が、２つのコッタ半体のいずれか一方の内周に必ず当接する。このため、コッタ開きの先端部の配置に対して、コッタの位相（即ちコッタが配置される角度）がランダムに決定される場合においても、コッタを突っ張らせずに確実に開かせることができる。   The first portion may be evenly arranged along a circumferential direction of the cotter opening. With such a configuration, the first portion of the at least one cotter opening always comes into contact with the inner circumference of one of the two cotter halves. For this reason, even when the phase of the cotter (that is, the angle at which the cotter is arranged) is randomly determined with respect to the arrangement of the front end portion of the cotter opening, the cotter can be reliably opened without being stretched.

さらにまた、前記コッタ開きの先端部が、下方に向かうにつれ徐々に内径を縮径させるテーパ形状を有するようにしてもよい。このような構成により、よりスムーズにコッタを開かせることができる。   Furthermore, the tip of the cotter opening may have a taper shape that gradually reduces the inner diameter as it goes downward. With such a configuration, the cotter can be opened more smoothly.

本発明によれば、コッタ開きをコッタに挿入するに際して、スムーズにコッタを開かせて挿入することができるコッタ組付装置を提供することを目的とする。   An object of the present invention is to provide a cotter assembling apparatus that can smoothly open and insert a cotter when inserting the cotter opening into the cotter.

発明の実施の形態１．
本実施の形態１に係るコッタ組付装置は、コッタを開かせるコッタ開きを具備し、コッタ開きの先端部が、コッタの内周と当接し、且つ互いに離間して３以上設けられた第１の部分と、隣接する第１の部分の間に配置され、コッタ開きの中心軸と垂直な断面における側面から中心軸までの径方向の長さが第１の部分よりも短い第２の部分と、を含むものである。 Embodiment 1 of the Invention
The cotter assembling apparatus according to the first embodiment includes a cotter opening for opening the cotter, and the tip end of the cotter opening is in contact with the inner periphery of the cotter and is provided with three or more spaced apart from each other. And a second portion having a radial length from the side surface to the central axis in a cross section perpendicular to the central axis of the cotter opening and shorter than the first portion. , Including.

このようなコッタ組付装置によれば、コッタ開きをコッタに挿入するに際して、対向する力の発生を阻止してコッタが突っ張ることを防止することができるため、スムーズにコッタを開かせて挿入することができる。   According to such a cotter assembling apparatus, when inserting the cotter opening into the cotter, it is possible to prevent the cotter from being stretched by preventing generation of opposing forces, so that the cotter can be opened and inserted smoothly. be able to.

以下、図面を参照しながら本実施の形態１に係るコッタ組付装置について説明する。図１は、本発明の実施の形態１に係るコッタ組付装置を示す図である。図１（ａ）はコッタ組付装置を示す斜視図であり、図１（ｂ）はコッタ組付装置を示す断面図である。バルブステム２０の上端部にはコッタ４０を介してリテーナ３０が取り付けられる。リテーナ３０と図示しないシリンダヘッドとの間に、バルブスプリング５０が圧縮状態で配される。バルブスプリング５０は、バルブステム２０の外側に配置される。尚、バルブステム２０は、吸気弁のバルブステムでもよいし、排気弁のバルブステムでもよい。また、コッタ４０はバルブの回転を容易とするフリーバルブ用のコッタであり、真円を円周方向に２分割した１対のコッタ半体からなる。   Hereinafter, the cotter assembling apparatus according to the first embodiment will be described with reference to the drawings. FIG. 1 is a diagram showing a cotter assembling apparatus according to Embodiment 1 of the present invention. FIG. 1A is a perspective view showing a cotter assembling apparatus, and FIG. 1B is a cross-sectional view showing the cotter assembling apparatus. A retainer 30 is attached to the upper end portion of the valve stem 20 via a cotter 40. A valve spring 50 is disposed in a compressed state between the retainer 30 and a cylinder head (not shown). The valve spring 50 is disposed outside the valve stem 20. The valve stem 20 may be an intake valve valve stem or an exhaust valve valve stem. The cotter 40 is a free valve cotter that facilitates the rotation of the valve, and includes a pair of cotter halves obtained by dividing a perfect circle into two in the circumferential direction.

図に示すように、コッタ組付装置１０は、チャック爪１１と、本体１２と、コッタ押さえ１３と、コッタ開き１４と、を備えている。コッタ組付装置１０の本体１２外側には、リテーナ３０とバルブスプリング５０を押圧するチャック爪１１が設けられる。本体１２の内側には、コッタ４０を開かせる際にコッタ４０の姿勢を維持するコッタ押さえ１３と、コッタ４０を押し付けて開かせるコッタ開き１４が設けられる。コッタ開き１４は、コッタ押さえ１３を貫通して上下方向へスライド自在に設けられ、その先端部（下端部）には、後述する第１の部分及び第２の部分が形成されている。   As shown in the figure, the cotter assembling apparatus 10 includes a chuck claw 11, a main body 12, a cotter presser 13, and a cotter opening 14. A chuck claw 11 that presses the retainer 30 and the valve spring 50 is provided outside the main body 12 of the cotter assembly apparatus 10. Inside the main body 12, a cotter presser 13 that maintains the posture of the cotter 40 when the cotter 40 is opened and a cotter opening 14 that presses and opens the cotter 40 are provided. The cotter opening 14 passes through the cotter presser 13 and is slidable in the vertical direction. A first portion and a second portion, which will be described later, are formed at the tip portion (lower end portion).

図２は、本発明の実施の形態１に係るコッタ組付装置による組付け方法を説明するための図である。まず、コッタ組付装置１０にリテーナ３０及びコッタ４０を配置する。図２（ａ）に示される状態からコッタ組付装置１０を下降させて、コッタ開き１４をコッタ４０へと挿入し、コッタ４０を左右に開かせる（図２（ｂ）及び（ｃ））。そして、図２（ｃ）に示される状態から、コッタ押さえ１３でコッタ４０の姿勢を維持しながら、一旦バルブステム２０の凹部を越えて組付下降端まで下降させる（図２（ｄ）及び（ｅ））。その後、コッタ組付装置１０を上昇させると、コッタ４０の凸部がバルブステム２０の凹部へと倣いながら入り、図２（ｆ）に示すように組付が完了する。   FIG. 2 is a diagram for explaining an assembling method by the cotter assembling apparatus according to Embodiment 1 of the present invention. First, the retainer 30 and the cotter 40 are arranged on the cotter assembling apparatus 10. The cotter assembling apparatus 10 is lowered from the state shown in FIG. 2A, the cotter opening 14 is inserted into the cotter 40, and the cotter 40 is opened to the left and right (FIGS. 2B and 2C). Then, from the state shown in FIG. 2 (c), while maintaining the posture of the cotter 40 with the cotter presser 13, the cotter presser 13 is temporarily lowered to the assembly lowering end over the recess of the valve stem 20 (FIG. 2 (d) and ( e)). Thereafter, when the cotter assembling apparatus 10 is raised, the convex portion of the cotter 40 enters while following the concave portion of the valve stem 20, and the assembling is completed as shown in FIG.

図３は、本発明の実施の形態１に係るコッタ組付装置のコッタ開き先端部を示す図である。図３（ａ）は、コッタ開き１４の先端部を示す斜視図である。図に示すように、円柱形状を有するコッタ開き１４の先端部は、中心軸Ｃに沿って三つの平面により切断される（図において、例えば切断面１４ｂにより切断される）。長手方向（中心軸Ｃの軸方向）における切断面の長さは、コッタ開き１４を挿入するコッタ４０の深さよりも大きなものとする。コッタ開き１４の先端部は切断により円柱形状から略三角柱形状へと加工され、さらに、三角柱の頂点近傍がＲ加工される。即ち、三角柱の頂点近傍部分であり、コッタ４０への挿入に際してコッタ４０に最初に当接する角部（図において斜線により示す部分）が面取り加工される。これにより、コッタ開き１４がコッタ４０へと挿入するに際して、コッタ４０の損傷を防止することができる。   FIG. 3 is a view showing a cotter opening front end portion of the cotter assembling apparatus according to Embodiment 1 of the present invention. FIG. 3A is a perspective view showing the distal end portion of the cotter opening 14. As shown in the drawing, the tip end portion of the cotter opening 14 having a cylindrical shape is cut by three planes along the central axis C (in the drawing, for example, cut by a cutting surface 14b). The length of the cut surface in the longitudinal direction (axial direction of the central axis C) is greater than the depth of the cotter 40 into which the cotter opening 14 is inserted. The front end portion of the cotter opening 14 is processed from a cylindrical shape to a substantially triangular prism shape by cutting, and further, the vicinity of the apex of the triangular prism is R processed. That is, a corner portion (portion indicated by hatching in the drawing) which is a portion near the apex of the triangular prism and first contacts the cotter 40 when inserted into the cotter 40 is chamfered. Thereby, when the cotter opening 14 is inserted into the cotter 40, damage to the cotter 40 can be prevented.

図３（ｂ）は、コッタ開きの先端部を示す下面図である。図に示すように、第１の部分としての部分Ｐ１、Ｐ２、Ｐ３は、中心軸Ｃを中心とする円弧形状で外側に膨らんでおり、コッタ開き１４をコッタ４０へ挿入する際に、コッタ４０の内周と当接する。また、部分Ｐ１とＰ２、部分Ｐ１とＰ３、部分Ｐ２とＰ３はそれぞれ互いに離間して設けられる。第２の部分は、第１の部分を除いた部分であり、隣接する第１の部分の間に配置され、コッタ開き１４の中心軸Ｃと垂直な断面における側面から中心軸Ｃまでの径方向の長さが第１の部分よりも短い部分である。即ち、第２の部分は、コッタ開き１４をコッタ４０へ挿入する際に、コッタ４０の内周と当接しない部分である。Ｒ１は、コッタ開き１４の先端部におけるコッタ開き１４の外径を示し、コッタ４０の内径より大きな値とする。Ｒ２は、コッタ開き１４の先端部を除いた部分におけるコッタ開き１４の外径を示し、Ｒ１はＲ２よりも小さな値とする。   FIG. 3B is a bottom view showing the tip of the cotter opening. As shown in the figure, the parts P1, P2, and P3 as the first part bulge outward in an arc shape centered on the central axis C, and the cotter 40 is inserted when the cotter opening 14 is inserted into the cotter 40. Abuts with the inner circumference. Further, the portions P1 and P2, the portions P1 and P3, and the portions P2 and P3 are provided separately from each other. The second portion is a portion excluding the first portion, and is disposed between the adjacent first portions, and is a radial direction from the side surface to the central axis C in a cross section perpendicular to the central axis C of the cotter opening 14. Is a portion shorter than the first portion. That is, the second portion is a portion that does not contact the inner periphery of the cotter 40 when the cotter opening 14 is inserted into the cotter 40. R1 indicates the outer diameter of the cotter opening 14 at the tip of the cotter opening 14 and is larger than the inner diameter of the cotter 40. R2 indicates the outer diameter of the cotter opening 14 in the portion excluding the tip of the cotter opening 14, and R1 is set to a value smaller than R2.

図３（ｃ）は、コッタ開きの先端部の断面図である。コッタ開き１４の先端部は、中心軸Ｃと垂直な断面において、側面から中心軸Ｃまでの径方向の長さが異なる第１の部分及び第２の部分を含む。言い換えると、コッタ開き１４の先端部は、周方向の位置に従って、中心軸Ｃまでの距離が変化する。中心軸Ｃから側面までの距離Ｌ１及びＬ２について、距離Ｌ１は距離Ｌ２よりも大きなものとする。第１の部分は、コッタ開き１４の先端部における外周上に設けられ、中心軸Ｃからの距離がＬ１となる部分である（図において部分Ｐ１、Ｐ２、Ｐ３である）。第２の部分は、コッタ開き１４の先端部における外周上に設けられ、中心軸Ｃからの距離がＬ２となる部分である（図において、切断線Ｘ１−Ｘ１'、Ｘ２−Ｘ２'、Ｘ３−Ｘ３'上の部分である）。   FIG.3 (c) is sectional drawing of the front-end | tip part of a cotter opening. The distal end portion of the cotter opening 14 includes a first portion and a second portion having different radial lengths from the side surface to the central axis C in a cross section perpendicular to the central axis C. In other words, the distance from the tip of the cotter opening 14 to the central axis C changes according to the position in the circumferential direction. Regarding the distances L1 and L2 from the central axis C to the side surface, the distance L1 is greater than the distance L2. The first part is provided on the outer periphery of the tip part of the cotter opening 14 and has a distance L1 from the central axis C (parts P1, P2, and P3 in the drawing). The second portion is provided on the outer periphery of the tip end portion of the cotter opening 14 and has a distance L2 from the central axis C (in the drawing, cutting lines X1-X1 ′, X2-X2 ′, X3- X3 ′).

また、図３（ｃ）に示すように、コッタ開き１４の先端部を中心軸Ｃに沿って切断する平面の切断線Ｘ１−Ｘ１'、Ｘ２−Ｘ２'、Ｘ３−Ｘ３'は、切断線が正三角形を形成するように切断される。正三角形の頂点近傍に設けられる第１の部分Ｐ１、Ｐ２、Ｐ３は、コッタ開き１４の外周上に周方向に沿って均等に配される。即ち、第１の部分Ｐ１、Ｐ２、Ｐ３は、中心軸Ｃとのなす角度が略１２０度となるように形成される。このような構成により、第１の部分Ｐ１、Ｐ２、Ｐ３のうち、少なくとも１つの第１の部分が、一対のコッタ半体のいずれか片方のコッタ半体の内周に必ず当接する。このため、コッタ開き１４の先端部の配置に対して、コッタ４０の位相（即ちコッタ４０が配置される角度）がランダムに決定される場合においても、コッタ４０を突っ張らせずに確実に開かせることができる。   Further, as shown in FIG. 3C, plane cutting lines X1-X1 ′, X2-X2 ′, and X3-X3 ′ that cut the tip of the cotter opening 14 along the central axis C are cut lines. Cut to form equilateral triangles. The first portions P 1, P 2, P 3 provided in the vicinity of the apex of the equilateral triangle are equally arranged along the circumferential direction on the outer periphery of the cotter opening 14. That is, the first portions P1, P2, and P3 are formed so that the angle formed with the central axis C is approximately 120 degrees. With such a configuration, at least one of the first portions P1, P2, and P3 always comes into contact with the inner circumference of one of the pair of cotter halves. For this reason, even when the phase of the cotter 40 (that is, the angle at which the cotter 40 is disposed) is randomly determined with respect to the arrangement of the tip end portion of the cotter opening 14, the cotter 40 is reliably opened without being stretched. be able to.

さらに、コッタ開き１４の先端部は、中心軸Ｃ方向において下方に向かうにつれ徐々に内径を縮径させるテーパ形状を有する。このような構成により、よりスムーズにコッタを開かせることができる。   Furthermore, the tip of the cotter opening 14 has a tapered shape that gradually decreases the inner diameter as it goes downward in the direction of the central axis C. With such a configuration, the cotter can be opened more smoothly.

図４は、本発明の実施の形態１に係るコッタ開きがコッタを開く様子を示す図である。図４（ａ）はコッタを示す側面図であり、図４（ｂ）は上面図である。尚、図においては説明のため、１対のコッタ半体の片方のコッタ半体のみを実線で示している。図４（ａ）に示すように、コッタ開き１４がコッタ４０へと挿入する際には、コッタ開き１４の先端（下端）に設けられたテーパ面１４ａをコッタ４０へと押し付けながらコッタ４０を開かせる。このとき、図４（ｂ）に示すように、コッタ開き１４の先端部に設けられた第１の部分がコッタ４０の内周面に沿って当接するため、コッタ４０の半径方向に押圧力が発生する（図において、斜線部で示す部分に押圧力が発生する）。このため、コッタ４０を突っ張らせる原因となる方向の力（図では上下方向に対向する力Ｆ１及びＦ３）の発生を阻止して、コッタ４０を開かせるために必要な方向の力（図では左右方向の力Ｆ２）のみを得ることができる。従って、コッタ開き１４をコッタ４０に挿入するに際して、対向する力の発生を阻止して、スムーズにコッタ４０を開かせて挿入することができる。   FIG. 4 is a diagram showing how the cotter opening according to the first embodiment of the present invention opens the cotter. 4A is a side view showing the cotter, and FIG. 4B is a top view. In the drawing, for explanation, only one cotter half of a pair of cotter halves is shown by a solid line. As shown in FIG. 4A, when the cotter opening 14 is inserted into the cotter 40, the cotter 40 is opened while pressing the tapered surface 14 a provided at the tip (lower end) of the cotter opening 14 against the cotter 40. Make it. At this time, as shown in FIG. 4B, the first portion provided at the tip of the cotter opening 14 abuts along the inner peripheral surface of the cotter 40, so that the pressing force is applied in the radial direction of the cotter 40. (A pressing force is generated in the hatched portion in the figure). For this reason, the generation of force in the direction that causes the cotter 40 to be stretched (forces F1 and F3 facing in the vertical direction in the figure) is prevented, and the force in the direction necessary to open the cotter 40 (left and right in the figure). Only the directional force F2) can be obtained. Therefore, when inserting the cotter opening 14 into the cotter 40, it is possible to prevent the generation of opposing forces and smoothly open and insert the cotter 40.

その他の実施の形態．
尚、上述した実施の形態においては、第１の部分を３つとした場合について説明したが本発明はこれに限定されない。即ち、従来技術ではコッタ開き１３０の外周面の全範囲がコッタ４０の内周面に沿って当接するため、コッタ４０が突っ張ってしまい開くことができないものであったのに対して、本発明によれば、コッタ開き１４の先端部の形状について、コッタ４０の内周と当接し、且つ互いに離間して設けられる第１の部分を少なくとも３つ設けることで、コッタ４０を突っ張らせる原因となる方向の力の発生を阻止するものである。従って、第１の部分を３以上とした場合についても、同様の効果を得ることができる。 Other embodiments.
In the above-described embodiment, the case where the number of the first portions is three has been described, but the present invention is not limited to this. That is, in the prior art, since the entire range of the outer peripheral surface of the cotter opening 130 is in contact with the inner peripheral surface of the cotter 40, the cotter 40 is stretched and cannot be opened. According to this configuration, the shape of the front end portion of the cotter opening 14 is a direction that causes the cotter 40 to be stretched by providing at least three first portions that are in contact with the inner periphery of the cotter 40 and spaced apart from each other. It prevents the generation of power. Therefore, the same effect can be obtained even when the first portion is 3 or more.

さらに、本発明は上述した実施の形態のみに限定されるものではなく、既に述べた本発明の要旨を逸脱しない範囲において種々の変更が可能であることは勿論である。   Furthermore, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention described above.

本発明の実施の形態１に係るコッタ組付装置を示す図である。It is a figure which shows the cotter assembling apparatus which concerns on Embodiment 1 of this invention. 本発明の実施の形態１に係るコッタ組付装置による組付け方法を説明するための図である。It is a figure for demonstrating the assembly method by the cotter assembly apparatus which concerns on Embodiment 1 of this invention. 本発明の実施の形態１に係るコッタ組付装置のコッタ開き先端部を示す図である。It is a figure which shows the cotter opening front-end | tip part of the cotter assembling apparatus which concerns on Embodiment 1 of this invention. 本発明の実施の形態１に係るコッタ開きがコッタを開く様子を示す図である。It is a figure which shows a mode that the cotter opening which concerns on Embodiment 1 of this invention opens a cotter. 従来のコッタ組付装置による組付け方法を説明するための図である。It is a figure for demonstrating the assembly method by the conventional cotter assembly apparatus. 従来のコッタ組付装置についての問題点を説明するための図である。It is a figure for demonstrating the problem about the conventional cotter assembly apparatus.

符号の説明Explanation of symbols

１０ コッタ組付装置、
１１ チャック爪、
１２ 本体、
１３ コッタ押さえ、
１４ コッタ開き
２０ バルブステム、
３０ リテーナ、
４０ コッタ、
５０ バルブスプリング、
１１０ ハウジング、
１２０ コッタ押さえ、
１３０ コッタ開き、
１３１ テーパ面、
１４０ センターシャフト 10 cotter assembly device,
11 Chuck claw,
12 body,
13 Press the cotter,
14 Cotter opening 20 Valve stem,
30 Retainer,
40 cotters,
50 Valve spring,
110 housing,
120 cotter press,
130 open the cotter,
131 taper surface,
140 Center shaft

Claims (3)

コッタを開かせるコッタ開きを具備するコッタ組付装置において、
前記コッタ開きの先端部が、
前記コッタの内周と当接し、且つ互いに離間して３以上設けられた第１の部分と、
隣接する前記第１の部分の間に配置され、前記コッタ開きの中心軸と垂直な断面における側面から前記中心軸までの径方向の長さが前記第１の部分よりも短い第２の部分と、を含むコッタ組付装置。 In the cotter assembling apparatus having a cotter opening for opening the cotter,
The tip of the cotter opening is
A first portion that is in contact with the inner circumference of the cotter and spaced apart from each other by three or more;
A second portion disposed between the adjacent first portions, and having a radial length from a side surface to the central axis in a cross section perpendicular to the central axis of the cotter opening, shorter than the first portion; , A cotter assembling apparatus. 前記第１の部分が、前記コッタ開きの周方向に沿って均等に配される
ことを特徴とする請求項１記載のコッタ組付装置。 The cotter assembling apparatus according to claim 1, wherein the first portion is equally arranged along a circumferential direction of the cotter opening. 前記コッタ開きの先端部が、下方に向かうにつれ徐々に内径を縮径させるテーパ形状を有する
ことを特徴とする請求項１又は２記載のコッタ組付装置。 The cotter assembling apparatus according to claim 1 or 2, wherein a tip end portion of the cotter opening has a tapered shape in which an inner diameter is gradually reduced in a downward direction.
JP2007302372A 2007-11-22 2007-11-22 Cotta assembly device Expired - Fee Related JP4780092B2 (en)

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Publication number Priority date Publication date Assignee Title
JPS5997831A (en) * 1982-11-25 1984-06-05 Nisshin Kogyo Kk Grinding method of double head surface grinder
JPS6353630A (en) * 1986-08-22 1988-03-07 Ricoh Co Ltd Coordinates input device
JPS6362626A (en) * 1986-09-01 1988-03-18 Toshiba Corp Holding device for automatically assembling retainer
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Publication number Priority date Publication date Assignee Title
CN102777224A (en) * 2011-05-13 2012-11-14 平田机工株式会社 Retainer assembling apparatus and retainer assembling method
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CN102777224B (en) * 2011-05-13 2014-08-27 平田机工株式会社 Retainer assembling apparatus and retainer assembling method

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