JP2011153868A

JP2011153868A - Jig for equipment for testing characteristics of rubber bush

Info

Publication number: JP2011153868A
Application number: JP2010014593A
Authority: JP
Inventors: Seiichi Oyama; 誠一大山; Takashi Moriya; 隆守屋; Nobuhiko Sugihara; 伸彦杉原; Hiroki Tanaka; 浩毅田中; Keisuke Takada; 啓介高田; Hiroaki Ekuni; 裕明江国
Original assignee: Kurashiki Kako Co Ltd
Current assignee: Kurashiki Kako Co Ltd
Priority date: 2010-01-26
Filing date: 2010-01-26
Publication date: 2011-08-11

Abstract

<P>PROBLEM TO BE SOLVED: To improve workability or the like at the time of the measurement of dynamic characteristics of a rubber bush. <P>SOLUTION: The core rod 10 of a first jig 1 is inserted in and fixed to the inner cylinder 200 of the rubber bush B, and the outer cylinder 201 is press-fitted in a press-fit ring 11 to constitute a test piece. A second jig 2 is mounted to one holding part 101a of a twist tester A to support the press-fit ring 11 while a third jig 3 is mounted to the other holding part 103a of the twist tester A to support both ends of the core rod 10 by two support arms 32. A square pillar 12a is provided at one end of the core rod 10, and a round rod 13b is provided at the other end of the core rod to externally fit a cubic member 14 in a revolvable manner. C-shaped grasping parts 33 and 34 are provided at the support arms 32 of the third jig 3, and the square pillar 12a and the cubic member 14 are grasped by the grasping parts so that both upper and under surfaces of them are wholly made parallel. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は、ラバーブッシュの静特性や動特性、耐久性等を試験する特性試験装置用の治具に関する。 The present invention relates to a jig for a characteristic test apparatus for testing the static characteristics, dynamic characteristics, durability, and the like of a rubber bush.

従来より、例えば自動車のサスペンション等に広く用いられているラバーブッシュは、図７に符号Ｂとして示すように、内筒２００と外筒２０１との間にゴム等の弾性部材２０２が接着固定された円筒状をなす。こうしたラバーブッシュＢには多様な負荷がかかるので、筒軸の方向やこれに直交する方向の引張り、圧縮、曲げ試験の他に捩り（ねじり）試験や抉り（こじり）試験も行われる。 Conventionally, for example, a rubber bush widely used in automobile suspensions or the like has an elastic member 202 made of rubber or the like bonded and fixed between an inner cylinder 200 and an outer cylinder 201 as indicated by reference numeral B in FIG. It has a cylindrical shape. Since various loads are applied to the rubber bush B, a torsion test or a twist test is performed in addition to a tensile test, a compression test, a bending test in the direction of the cylinder axis and the direction orthogonal thereto.

例えば捩り試験は、同図(a)の矢印Ｐ１に示すように外筒２０１の筒軸線ｒの周りに正逆両方の向きの捩り負荷を付与して動ばね特性を測定するものである。また、抉り試験は、同図(b)の矢印Ｐ２に示すように外筒２０１を固定した状態で、内筒２００を筒軸線ｒに直交する任意の軸線ｒ’の周りに揺動させることにより、弾性部材２０２に抉り負荷を付与して動ばね特性を測定するものである。 For example, in the torsion test, dynamic spring characteristics are measured by applying a torsional load in both forward and reverse directions around the cylinder axis r of the outer cylinder 201 as indicated by an arrow P1 in FIG. Further, the turning test is performed by swinging the inner cylinder 200 around an arbitrary axis r ′ orthogonal to the cylinder axis r in a state where the outer cylinder 201 is fixed as indicated by an arrow P2 in FIG. The dynamic spring characteristics are measured by applying a rolling load to the elastic member 202.

このような捩り試験、抉り試験を行うための試験装置として特許文献１には、相対向する一対のつかみ具によってそれぞれ、丸棒状の供試体の両端部を把持して相対的に回動させることにより捩りトルクを付与しながら、一方のつかみ具の側では角変位を、また他方のつかみ具の側ではトルクを検出するようにした捩り試験機について記載されている。 As a test apparatus for performing such a torsion test and a torsion test, Patent Document 1 discloses that a pair of gripping tools facing each other hold both ends of a round bar-shaped specimen and rotate them relatively. Describes a torsion testing machine that detects angular displacement on the side of one gripper and detects torque on the side of the other gripper while applying a torsional torque.

そのような捩り試験機を用いて抉り試験を行う場合にはつかみ具に代えて、或いはそれに加えて別の治具を取り付ける必要があるが、これについて本願の出願人は、捩り試験と抉り試験とに共用することができる治具の発明について既に特許出願をしている（特許文献２を参照）。 When a torsion test is performed using such a torsion tester, it is necessary to attach another jig in place of or in addition to the gripping tool. A patent application has already been filed for the invention of a jig that can be used in common (see Patent Document 2).

この先願に係る治具は、ラバーブッシュに取り付ける第１の治具と、特性試験装置の一対の保持部にそれぞれ取り付ける第２、第３の治具とを組み合わせたもので、まず、第１治具の内筒支持部材を、その両端側が突出するようにしてラバーブッシュの内筒に挿入固定するとともに、同外周支持部材によってラバーブッシュの外周を把持する。 The jig according to this prior application is a combination of the first jig attached to the rubber bush and the second and third jigs respectively attached to the pair of holding portions of the characteristic test apparatus. The inner cylinder support member of the tool is inserted and fixed to the inner cylinder of the rubber bush so that both end sides thereof protrude, and the outer periphery of the rubber bush is gripped by the outer periphery support member.

そして、抉り試験を行うときには、ラバーブッシュの中心線が捩り試験機における回動軸線と直交して左右に延びるように、第２治具により前記外周支持部材を支持するとともに、左右に延びる内筒支持部材の両端側をそれぞれ第３治具の２つの支持腕によって支持する。 When performing a sag test, the outer cylinder is supported by the second jig so that the center line of the rubber bush extends to the left and right perpendicular to the rotation axis of the torsion tester, and the inner cylinder extends to the left and right. Both ends of the support member are supported by the two support arms of the third jig.

すなわち、内筒支持部材の両端側にはそれぞれ円柱状の被把持部が設けられており、一方、支持腕の先端部には、突き合わせ接合される一対の板片が設けられ、この各板片の突き合わせ面に各々前記被把持部に対応する断面半円形状の溝部が凹み形成されている。そして、それらの板片同士を突き合わせ各々の溝部により前記被把持部を挟み込んで、把持するようになっている。 In other words, columnar gripped portions are provided on both end sides of the inner cylinder support member, while a pair of plate pieces to be butt-joined are provided at the distal end portion of the support arm. A groove portion having a semicircular cross section corresponding to the gripped portion is formed in each of the butted surfaces. Then, the plate pieces are brought into contact with each other, and the gripped portion is sandwiched between the respective groove portions to be gripped.

特開平１０−１００２６号公報Japanese Patent Laid-Open No. 10-10026 特開２００８−２８６６２５号公報JP 2008-286625 A

ところで、ラバーブッシュの内外筒は概ね同一軸線上にあることが多いが、それらが少しずれていたり、或いは２つの軸線が交差して少し斜めになっているものもある。このようなラバーブッシュの試験を行うためには、内外筒が互いに斜めになった状態でも試験機に取り付けられるよう、治具の構成に工夫する必要がある。 By the way, the inner and outer cylinders of the rubber bush are often on the same axis, but there are cases where they are slightly shifted, or two axes are slightly crossed and inclined. In order to perform such a rubber bush test, it is necessary to devise a jig configuration so that the inner and outer cylinders can be attached to the testing machine even when they are oblique to each other.

この点、前記後者の従来例（特許文献２）に記載の治具では、第２治具によりラバーブッシュの外周を把持する一方、その内筒を貫通する内筒支持部材の両端部（被把持部）は、第３治具の支持腕の板片における溝部により挟み込むようにしており、内外筒が互いに斜めになっていると取り付けることができない。 In this respect, in the jig described in the latter conventional example (Patent Document 2), the outer circumference of the rubber bush is gripped by the second jig, while both end portions of the inner cylinder support member penetrating the inner cylinder (the object to be gripped). Part) is sandwiched between the grooves in the plate of the support arm of the third jig, and cannot be attached if the inner and outer cylinders are inclined to each other.

勿論、前記支持腕における板片の溝部を斜めに形成すれば、内外筒が互いに斜めになっていても取り付けることができるが、そのためには試験に供するラバーブッシュの内外筒の傾斜度合いに応じて異なる治具を準備し、一々交換して試験しなくてはならないから、作業負担や試験コストの徒な増大を招くことになる。 Of course, if the groove portion of the plate piece in the support arm is formed obliquely, it can be attached even if the inner and outer cylinders are inclined to each other, but for that purpose, depending on the degree of inclination of the inner and outer cylinders of the rubber bush used for the test Since different jigs must be prepared, replaced one by one and tested, the work load and test cost will increase.

本発明は斯かる点に鑑みてなされたもので、その目的は、ラバーブッシュの外周の中心線に対して内筒が斜めになっている場合でも捩り試験機に取り付けて、試験に供することのできる治具を提供することにある。 The present invention has been made in view of such points, and its purpose is to attach it to a torsion tester even when the inner cylinder is slanted with respect to the center line of the outer periphery of the rubber bush, and use it for the test. It is to provide a jig that can be used.

前記の目的を達成するために本発明では、ラバーブッシュの内筒を支持する内筒支持部材の両端部にそれぞれ、互いに平行な一対の被把持面を有する被把持部を設けて、これを２つの支持腕のそれぞれのコ字状の把持部によって把持したときに、それら被把持部の各々の被把持面全てが平行になるようにしている。 In order to achieve the above object, in the present invention, gripped portions having a pair of gripped surfaces parallel to each other are provided at both ends of the inner tube support member that supports the inner tube of the rubber bush. When gripped by the U-shaped gripping portions of the two support arms, all the gripped surfaces of the gripped portions are made parallel.

すなわち、請求項１の発明は、相対向する一対の保持部の間にラバーブッシュを保持し、それらの保持部同士を所定の軸周りに相対回動させて特性試験を行うようにした特性試験装置用の治具であって、前記ラバーブッシュの内筒に、両端部がそれぞれ突出するように挿入固定される棒状の内筒支持部材、及び当該ラバーブッシュの外周を把持する筒状の外周把持部材からなる第１治具と、前記特性試験装置の一方の保持部に装着され、他方の保持部に向かって延びる支持腕によって前記外周把持部材を、その筒軸線と前記保持部同士の相対回動軸線とが交差するように支持する第２治具と、前記他方の保持部に装着され、前記一方の保持部に向かってそれぞれ延びる２つの支持腕によって、前記内筒支持部材の両端部を支持する第３治具と、を備えるものとする。 That is, the invention of claim 1 is a characteristic test in which a rubber bush is held between a pair of opposing holding parts, and the holding parts are relatively rotated around a predetermined axis to perform a characteristic test. A jig for an apparatus, a rod-shaped inner cylinder support member inserted and fixed to the inner cylinder of the rubber bush so that both ends protrude from each other, and a cylindrical outer periphery gripping the outer periphery of the rubber bush The outer peripheral gripping member is attached to a first jig made of a member and a support arm that is attached to one holding portion of the characteristic test apparatus and extends toward the other holding portion, and the relative rotation between the cylindrical axis and the holding portions is performed. Two ends of the inner cylinder support member are attached to a second jig supported so as to intersect with the movement axis, and two support arms attached to the other holding portion and extending toward the one holding portion. A third jig to support It shall be equipped with a.

そして、前記内筒支持部材の長手方向の両端部にはそれぞれ、互いに平行な一対の被把持面を有する被把持部を設けて、この両被把持部同士を内筒支持部材の軸心周りに相対回動可能とする一方、これら両被把持部を把持するように前記第３治具の２つの支持腕にはそれぞれコ字状の把持部を設けて、これにより把持した前記各被把持部の各々の被把持面全てが平行になるようにした。 Further, gripped portions having a pair of gripped surfaces parallel to each other are provided at both ends in the longitudinal direction of the inner cylinder support member, and both the gripped portions are arranged around the axis of the inner cylinder support member. Each of the gripped parts gripped by providing a U-shaped grip part on each of the two support arms of the third jig so as to grip both gripped parts while allowing relative rotation. All the surfaces to be gripped were made parallel.

斯かる構成の治具を用いてラバーブッシュの抉り試験をするときには、まず、内筒に第１治具の内筒支持部材を挿入固定するとともに、ラバーブッシュの外周を外周把持部材で把持して供試体を構成する。また、その供試体を保持する特性試験装置の一方の保持部には第２治具を、他方の保持部には第３治具をそれぞれ装着する。 When the rubber bushing test is performed using the jig having such a configuration, first, the inner cylinder support member of the first jig is inserted and fixed in the inner cylinder, and the outer periphery of the rubber bush is held by the outer periphery holding member. Configure the specimen. In addition, the second jig is attached to one holding portion of the characteristic test apparatus that holds the specimen, and the third jig is attached to the other holding portion.

そして、前記保持部同士の相対回動軸線とラバーブッシュの外周の中心線とが交差するように、第２治具の支持腕によって供試体の外周把持部材を支持するとともに、当該供試体における内筒支持部材の両端部をそれぞれ第３治具の一対の支持腕によって支持する。この状態で保持部同士を相対回動させれば、ラバーブッシュに所定の抉り負荷を与えてその特性を調べることができる。 And while supporting the outer periphery holding member of a test piece with the support arm of a 2nd jig so that the relative rotation axis line of the said holding | maintenance parts and the centerline of the outer periphery of a rubber bush may cross | intersect, Both ends of the tube support member are supported by a pair of support arms of the third jig. If the holding parts are rotated relative to each other in this state, it is possible to examine the characteristics of the rubber bush by applying a predetermined rolling load.

ここで、前記のように第３治具の２つの支持腕によってそれぞれ内筒支持部材の両端部が支持されるときには、この各端部の被把持部が支持腕のコ字状の把持部によって把持されて、当該被把持部の被把持面全てが平行に位置づけられる。このため、ラバーブッシュの外周の中心線に対して内筒が斜めになっていても、これを貫通する内筒支持部材を前記平行な把持面及び被把持面の間に斜めに把持することができ、問題なく捩り試験機に取り付けることができる。 Here, when both ends of the inner cylinder support member are supported by the two support arms of the third jig as described above, the gripped portions at the ends are supported by the U-shaped grip portions of the support arms. By being gripped, all of the gripped surfaces of the gripped portion are positioned in parallel. For this reason, even if the inner cylinder is inclined with respect to the center line of the outer periphery of the rubber bush, the inner cylinder support member that penetrates the inner cylinder can be held obliquely between the parallel gripping surface and the gripped surface. Can be attached to the torsion tester without any problem.

前記内筒支持部材として好ましいのは、それを長手方向に２つの部材（分割部材）に分割し、一方の分割部材の端部には一体に被把持部を形成する一方、他方の分割部材の端部は丸棒状に形成して、そこに相対回動可能に外嵌めする別体部材に被把持部を形成することである（請求項２）。 The inner cylinder support member is preferably divided into two members (divided members) in the longitudinal direction, and a gripped portion is integrally formed at the end of one divided member, while the other divided member is The end portion is formed in a round bar shape, and the gripped portion is formed on a separate member that is fitted on the end portion so as to be relatively rotatable.

こうすると、２つの分割部材をラバーブッシュの内筒にその両端側から組み付けて、内筒支持部材を構成することになるので、その両端部に設ける被把持部を内筒の内径よりも大きな外形状にすることができる。つまり、被把持面の面積を十分に大きく設定することができて、耐久性の確保に有利になる。 In this way, the two divided members are assembled to the inner cylinder of the rubber bush from both ends thereof to constitute the inner cylinder support member. Therefore, the gripped portions provided at both ends of the outer cylinder are larger than the inner diameter of the inner cylinder. It can be shaped. That is, the area of the gripped surface can be set sufficiently large, which is advantageous for ensuring durability.

また、その別体部材は、互いに突き合わされる一対の半割部材によって構成するのが好ましいく、これら半割部材同士の突き合わせ面にはそれぞれ、内筒支持部材の前記丸棒状の端部に対応する断面略半円形状の溝部を凹み形成するのがよい（請求項３）。これら一対の半割部材を突き合わせて別体部材を構成すれば、それらの溝部の間にガタのない状態で前記丸棒状の端部を把持することができ、抉り試験の精度を高める上で有利になる。 Further, the separate member is preferably constituted by a pair of half members that are abutted against each other, and the abutment surfaces of the half members correspond to the round bar-shaped end portions of the inner cylinder support member, respectively. It is preferable to form a recess having a substantially semicircular cross section. If a separate member is configured by abutting the pair of half members, the round bar-shaped end portion can be gripped without any play between the groove portions, which is advantageous in increasing the accuracy of the rolling test. become.

さらに、好ましいのは前記第３治具の２つの支持腕の各把持部と、これにより把持される内筒支持部材の被把持部との間に、それぞれ、焼き入れを施した鋼板からなるスペーサ部材を介在させることであり（請求項４）、こうすれば耐久性はさらに向上する。その場合に前記の把持部や被把持部、或いは別体部材に磁石を埋設すれば（請求項５）、それらの着脱が容易でありながら、紛失する心配が少なくなる。 Furthermore, it is preferable that the spacer is made of a steel plate that has been quenched between the gripping portions of the two support arms of the third jig and the gripped portion of the inner cylinder support member gripped by the gripping portions. By interposing a member (claim 4), the durability is further improved. In that case, if a magnet is embedded in the gripping part, the gripped part, or a separate member (Claim 5), it is easy to attach and detach them, but the risk of losing them is reduced.

一方で、ラバーブッシュの外周を支持するための第２治具として好ましいのは、その支持腕を第１治具の外周把持部材の外周を把持するように構成し、この外周把持部材の外周面とこれに当接する前記支持腕の把持面とに、互いに嵌合するように凹凸嵌合部を設けることである（請求項６）。 On the other hand, the second jig for supporting the outer periphery of the rubber bush is preferably configured so that the support arm grips the outer periphery of the outer periphery gripping member of the first jig, and the outer peripheral surface of the outer periphery gripping member. And an uneven fitting portion so as to be fitted to each other on the holding surface of the support arm in contact therewith (Claim 6).

こうすれば第２治具によって、ラバーブッシュの中心線が特性試験装置の保持部の相対回動軸線と交差するよう容易に位置決めすることができ、取り付けが容易になる上に作業バラツキが軽減されて、抉り試験の精度を高める上で有利になる。 In this way, the second jig can easily position the rubber bush so that the center line of the rubber bush intersects the relative rotation axis of the holding portion of the characteristic test apparatus, which facilitates installation and reduces work variations. This is advantageous in increasing the accuracy of the squeeze test.

以上、説明したように本発明に係る治具を用いてラバーブッシュを取り付ければ、汎用の捩り試験機を用いて抉り試験を容易に且つ精度よく行うことができる。ラバーブッシュの外筒の筒軸線或いは外周の中心線に対して内筒が斜めになっている場合でも、また、その傾斜度合いが異なるラバーブッシュについても治具の交換が不要になって、作業負担や試験コストの徒な増大を招くことがない。 As described above, if the rubber bush is attached using the jig according to the present invention, the rolling test can be easily and accurately performed using a general-purpose torsion tester. Even when the inner cylinder is slanted with respect to the cylinder axis of the outer cylinder of the rubber bush or the center line of the outer circumference, and for the rubber bush with a different degree of inclination, it is not necessary to replace the jig, and the work load And test costs are not increased.

また、そうして抉り試験を行うときに強い力がかかる内筒支持部材の両端部の被把持部を、それぞれ十分な大きさにして摩耗を抑制し、耐久性を確保することができる。さらに焼き入れ鋼板からなるスペーサ部材を介在させれば、耐久性はより向上する。 In addition, the gripped portions at both ends of the inner cylinder support member to which a strong force is applied when performing the rolling test can be made sufficiently large to suppress wear and ensure durability. Furthermore, if a spacer member made of a quenched steel plate is interposed, the durability is further improved.

本発明に係る治具の装着された捩り試験機の全体構成を示す概略図である。It is the schematic which shows the whole structure of the torsion testing machine with which the jig | tool which concerns on this invention was mounted | worn. 第１〜第３治具によって試験機に供試体を取り付けた状態の拡大図である。It is an enlarged view of the state which attached the test body to the testing machine with the 1st-3rd jig | tool. ラバーブッシュに第１治具を取り付けて構成した供試体の縦断面図である。It is a longitudinal cross-sectional view of the test body comprised by attaching the 1st jig | tool to the rubber bush. 第２、第３治具の一部を取り除いて少し上方から見た図２相当図である。FIG. 3 is a view corresponding to FIG. 2 as seen from above with some of the second and third jigs removed. 第２、第３治具をそれぞれ拡大して示す側面図である。It is a side view which expands and shows a 2nd and 3rd jig | tool, respectively. センターずれによる試験結果（静ばね定数）の変化を示すグラフ図である。It is a graph which shows the change of the test result (static spring constant) by center shift | offset | difference. 一般的なラバーブッシュの構成の説明図であり、(a)は側面図で(b)はそのb-b線断面図である。It is explanatory drawing of a structure of a general rubber bush, (a) is a side view, (b) is the bb sectional view taken on the line.

以下、本発明の実施形態を図面に基づいて詳細に説明する。尚、以下の好ましい実施形態の説明は本質的に例示に過ぎず、本発明、その適用物或いはその用途を制限することを意図するものではない。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, the following description of preferable embodiment is only an illustration essentially, and is not intending restrict | limiting this invention, its application thing, or its use.

−特性試験装置−
図１は、本発明の一形態に係る治具Ｊを装着したラバーブッシュの特性試験装置の全体構成を概略的に示している。この例では特性試験装置として汎用の捩り試験機Ａを用いており、安定した床等に設置された基台１００と、その上面に固定された固定装置１０１と、ハンドル１０２の操作で移動可能な可動装置１０３とを備えている。固定装置１０１と可動装置１０３とは、その可動装置１０３の移動方向（図の左右方向）に相対向して配設されており、図示しないが、固定装置１０１内には電動モータや角変位の検出器、各種制御装置等が、また可動装置１０３内にはトルク検出器がそれぞれ装備されている。 -Characteristic test equipment-
FIG. 1 schematically shows the overall configuration of a rubber bush characteristic test apparatus equipped with a jig J according to an embodiment of the present invention. In this example, a general-purpose torsion tester A is used as a characteristic test apparatus, which can be moved by operating a base 100 installed on a stable floor or the like, a fixing device 101 fixed on the upper surface thereof, and a handle 102. And a movable device 103. The fixed device 101 and the movable device 103 are arranged opposite to each other in the moving direction of the movable device 103 (the left-right direction in the figure). Although not shown, the fixed device 101 includes an electric motor and an angular displacement. A detector, various control devices, and the like are provided, and a torque detector is provided in the movable device 103.

それら両装置１０１，１０３の相対向する側面にはそれぞれ、水平方向の共通の軸線Ｒを中心とする略円盤状の保持部１０１ａ，１０３ａが配設されていて、その間にラバーブッシュの供試体を保持するようになっている。図示は省略するが、それら一対の保持部１０１ａ，１０３ａの相対向する平滑な端面には、所定箇所にボルト穴が開口しており、後述するように、これらのボルト穴を利用して両保持部１０１ａ，１０３ａに治具Ｊを装着し、この治具Ｊを介してラバーブッシュを取り付ける。 On the opposite side surfaces of both devices 101 and 103, substantially disc-shaped holding portions 101a and 103a centering on a common axis R in the horizontal direction are arranged, respectively, and a rubber bush specimen is placed between them. It comes to hold. Although illustration is omitted, bolt holes are opened at predetermined locations on the opposing smooth end faces of the pair of holding portions 101a and 103a, and both holdings are made using these bolt holes as will be described later. A jig J is attached to the portions 101a and 103a, and a rubber bush is attached through the jig J.

図の例では左側に示す固定装置１０１側の保持部１０１ａが電動モータにより回動されるようになっていて、一方、同右側に示す可動装置１０３側の保持部１０３ａは非回転状態とされる。つまり、一対の保持部１０１ａ，１０３同士が相対的に軸線Ｒの周りに回動し、それらの間に保持されたラバーブッシュには正逆方向の負荷が交互に加えられる。これによりラバーブッシュの捩りや抉りについて動ばね定数等の動特性を調べることができる。勿論、静ばね定数等の静特性や耐久性等を調べることもできる。 In the example of the drawing, the holding unit 101a on the fixing device 101 side shown on the left side is rotated by an electric motor, while the holding unit 103a on the movable device 103 side shown on the right side is in a non-rotating state. . That is, the pair of holding portions 101a and 103 relatively rotate around the axis R, and forward and reverse loads are alternately applied to the rubber bush held between them. As a result, the dynamic characteristics such as the dynamic spring constant can be examined for the torsion and twist of the rubber bush. Of course, static characteristics such as static spring constant, durability, etc. can also be examined.

図２に拡大して示すように治具Ｊは、それぞれ鋼材の加工品である第１治具１、第２治具２及び第３治具３によって構成されている。以下に詳細に述べるように、第１治具１はラバーブッシュＢに取り付けられて供試体を構成する（図３を参照）。第２治具２は固定装置１０１側の保持部１０１ａに装着されて、ラバーブッシュＢの外筒２０１を支持し、一方、第３治具３は可動装置１０３側の保持部１０３ａに装着されて、ラバーブッシュＢの内筒２００を支持する。 As shown in an enlarged view in FIG. 2, the jig J includes a first jig 1, a second jig 2, and a third jig 3, which are processed products of steel. As described in detail below, the first jig 1 is attached to the rubber bush B to form a specimen (see FIG. 3). The second jig 2 is attached to the holding portion 101a on the fixing device 101 side and supports the outer cylinder 201 of the rubber bush B, while the third jig 3 is attached to the holding portion 103a on the movable device 103 side. The inner cylinder 200 of the rubber bush B is supported.

−第１治具−
図３は、ラバーブッシュＢに第１治具１を組み付けて構成した供試体の断面図であり、図４には、その供試体の捩り試験機Ａへの取り付け状態を示すために第２及び第３治具２，３の一部を取り除いて、図２よりもやや上方から示している。尚、ここでは図７に例示するような内筒２００及び外筒２０１を備えたラバーブッシュＢについて説明するが、外筒２０１は必ずしも必須ではなく、外筒のないラバーブッシュであればゴム弾性体２０２の外周を以下の圧入リング１１に圧入すればよい。 -First jig-
FIG. 3 is a cross-sectional view of a specimen configured by assembling the first jig 1 on the rubber bush B. FIG. A part of the third jigs 2 and 3 are removed, and the third jigs 2 and 3 are shown from slightly above FIG. Here, the rubber bush B provided with the inner cylinder 200 and the outer cylinder 201 as illustrated in FIG. 7 will be described. However, the outer cylinder 201 is not indispensable, and any rubber bush without an outer cylinder is a rubber elastic body. What is necessary is just to press-fit the outer periphery of 202 into the following press-fit ring 11.

すなわち、この例では第１治具１は、図示のようにラバーブッシュＢの内筒２００に挿入固定される芯棒１０（内筒支持部材）と、ラバーブッシュＢの外筒２０１が圧入される圧入リング１１（外周把持部材）とからなり、芯棒１０はその長手方向に２分割されている。同図の左側に示す第１の部材１２（一方の分割部材）は、略正方形断面の角柱部１２ａと、その一端から同軸状に延びる丸棒部１２ｂとからなり、この丸棒部１２ｂの先端側にはねじ部１２ｃが形成されている。 That is, in this example, the first jig 1 is press-fitted with the core rod 10 (inner cylinder support member) inserted and fixed to the inner cylinder 200 of the rubber bush B and the outer cylinder 201 of the rubber bush B as shown in the figure. It consists of a press-fitting ring 11 (peripheral gripping member), and the core rod 10 is divided into two in the longitudinal direction. The first member 12 (one divided member) shown on the left side of the figure is composed of a prismatic part 12a having a substantially square cross section and a round bar part 12b extending coaxially from one end thereof, and the tip of this round bar part 12b. A threaded portion 12c is formed on the side.

一方、その第１部材１２と組み合わされる第２部材１３（他方の分割部材）は、前記角柱部１２ａの断面の一辺と略同寸の外径を有する円柱部１３ａと、これに比べて小径の丸棒部１３ｂとが同心状に連なっている。円柱部１３ａには、前記第１部材１２のねじ部１２ｃが螺入されるねじ穴１３ｃが形成されている一方、図に仮想線で示すように丸棒部１３ｂには、第１部材１２の角柱部１２ａと略同じ断面形状を有する別体の部材１４が外嵌めされるようになっている。 On the other hand, the second member 13 (the other divided member) combined with the first member 12 is a cylindrical portion 13a having an outer diameter substantially the same as one side of the cross section of the prismatic portion 12a, and a smaller diameter than this. The round bar portion 13b is concentrically connected. The cylindrical portion 13a is formed with a screw hole 13c into which the screw portion 12c of the first member 12 is screwed, and the round bar portion 13b has a first member 12 as shown by an imaginary line in the drawing. A separate member 14 having substantially the same cross-sectional shape as that of the prism portion 12a is externally fitted.

そして、前記第１部材１２の丸棒部１２ｂがその先端側からラバーブッシュＢの内筒２００の一側（図３の左側）に挿入され、反対側に突き出た先端のねじ部１２ｃが第２部材１３のねじ穴１３ｃに螺入されている。つまり、芯棒１０は、その両端部を突出させた状態でラバーブッシュＢの内筒２００に挿入され、一端側の第１部材１２の角柱部１２ａと他端側の第２部材１３の円柱部１３ａとの間に内筒２００を挟み込み、ガタのない状態でしっかりと固定されている。 Then, the round bar portion 12b of the first member 12 is inserted into one side (the left side in FIG. 3) of the inner cylinder 200 of the rubber bush B from the tip side, and the screw portion 12c at the tip protruding to the opposite side is the second. It is screwed into the screw hole 13 c of the member 13. That is, the core rod 10 is inserted into the inner cylinder 200 of the rubber bush B with both ends thereof protruding, and the columnar portion 12a of the first member 12 on one end side and the cylindrical portion of the second member 13 on the other end side. The inner cylinder 200 is sandwiched between 13a and 13a, and is firmly fixed without play.

そうしてラバーブッシュＢの内筒２００から一方の側に突き出した芯棒１０の端部（図３の左側の端部）には角柱部１２ａが設けられ、反対側に突き出した他端側の丸棒部１３ｂには別体の部材１４（詳しくは後述する）が外嵌めされていて、それぞれが第３治具３の左右２つの支持腕３２，３２により、即ちその先端側に設けられたコ字状の把持部によって把持されるようになる。尚、この例では図２の手前側に示すように、前記別体の部材１４は略立方体状とされているので、以下、立方体部材１４と呼ぶ。 Thus, a prismatic part 12a is provided at the end of the core 10 protruding from the inner cylinder 200 of the rubber bush B to one side (the left end in FIG. 3), and the other end protruding from the opposite side. Separate members 14 (details will be described later) are externally fitted to the round bar portion 13b, and each is provided by the left and right support arms 32, 32 of the third jig 3, that is, on the tip side thereof. It is gripped by the U-shaped gripping part. In this example, as shown in the front side of FIG. 2, the separate member 14 has a substantially cubic shape, and is hereinafter referred to as a cubic member 14.

そのようにラバーブッシュＢの内筒２００に挿入固定される芯棒１０に対して、圧入リング１１はこの例では円筒状の部材であり、その内周にラバーブッシュＢの外筒２０１が圧入される。一方、圧入リング１１の外周にはそのリング軸線ｒ方向の中央部位において全周を周回する環状の溝部１１ａが形成されていて、以下に述べるように第２治具２の支持腕２２によって支持（把持）されたときに、捩り試験機Ａの相対回動軸線Ｒに対して圧入リング１１を位置決めするようになっている。 In this example, the press-fitting ring 11 is a cylindrical member with respect to the core 10 inserted and fixed in the inner cylinder 200 of the rubber bush B, and the outer cylinder 201 of the rubber bush B is press-fitted into the inner periphery thereof. The On the other hand, the outer periphery of the press-fitting ring 11 is formed with an annular groove portion 11a that goes around the entire circumference at the central portion in the direction of the ring axis r, and is supported by the support arm 22 of the second jig 2 as described below ( The press-fitting ring 11 is positioned with respect to the relative rotation axis R of the torsion tester A.

−第２治具−
前記のように圧入リング１１を支持する第２治具２は、図２、４に示すように、捩り試験機Ａの固定装置１０１側の保持部１０１ａに装着される。すなわち、第２治具２は矩形板状のベース部２１を有し、これが前記保持部１０１ａの端面に重ね合わされて４隅付近をボルト２０，２０，…によって締結されている。このベース部２１の下半部における左右の中央部位からは、長方形板状の支持腕２２が略直交して突出し、図５(a)にも示すように軸線Ｒに沿って可動装置１０３側（他方の保持部の側）に延びている。 -Second jig-
As described above, the second jig 2 that supports the press-fitting ring 11 is attached to the holding portion 101a on the fixing device 101 side of the torsion tester A, as shown in FIGS. That is, the second jig 2 has a rectangular plate-like base portion 21 which is overlapped with the end surface of the holding portion 101a and fastened at four corners by bolts 20, 20,. A rectangular plate-like support arm 22 protrudes substantially perpendicularly from the left and right central portions of the lower half of the base portion 21, and as shown in FIG. 5 (a), along the axis R, the movable device 103 side ( It extends to the other holding part side).

前記の支持腕２２には、それと略同じ形状のブロック部材２３が上方から組み付けられて、その間に前記ラバーブッシュＢの供試体における圧入リング１１を把持するようになっている。すなわち、図５(a)にのみ符号を付して示すが、支持腕２２とブロック部材２３とにはそれぞれ、圧入リング１１の形状に対応する断面半円形状の凹部２２ａ，２３ａが形成されていて、これら対をなす凹部２３ａ，２２ａの間に圧入リング１１を挟み込んだ状態で、締結されるようになる。 A block member 23 having substantially the same shape as that of the support arm 22 is assembled from above, and the press-fitting ring 11 in the specimen of the rubber bush B is held between them. 5A, only the support arm 22 and the block member 23 are provided with recesses 22a and 23a having semicircular cross sections corresponding to the shape of the press-fitting ring 11, respectively. Thus, the press-fitting ring 11 is sandwiched between the pair of recesses 23a and 22a to be fastened.

具体的には図５(a)を参照すると、前記凹部２２ａを間に挟んで支持腕２２の先端寄り及び基端寄りの部位にはそれぞれ上下に延びるボルト穴２２ｂが形成され、これに対応してブロック部材２３の先端寄り及び基端寄りの部位にもそれぞれ上下に延びる貫通穴２３ｂが形成されている。そして、それら支持腕２２及びブロック部材２３を、凹部２２ａ，２３ａに圧入リング１１を挟んだ状態で突き合わせ、ブロック部材２３の各貫通穴に上方からボルト２４を挿通させて、その軸の下部を支持腕２２の各ボルト穴２２ｂに螺入し、締め付けるのである。 Specifically, referring to FIG. 5 (a), bolt holes 22b extending in the vertical direction are formed at portions close to the distal end and proximal end of the support arm 22 with the recess 22a interposed therebetween, corresponding to this. Through-holes 23b extending in the vertical direction are also formed in the portions near the distal end and the proximal end of the block member 23, respectively. The support arm 22 and the block member 23 are abutted against each other with the press-fit ring 11 sandwiched between the recesses 22a and 23a, and bolts 24 are inserted into the through holes of the block member 23 from above to support the lower portion of the shaft. It is screwed into each bolt hole 22b of the arm 22 and tightened.

尚、前記凹部２２ａ，２３ａの断面形状は正確には半円よりも少しだけ小さくされていて、前記のように圧入リング１１を間に挟んだ状態では支持腕２２及びブロック部材２３の突き合わせ面に小さな隙間が形成される。それ故、前記のようにボルト２４によって締め付けることで、支持腕２２及びブロック部材２３により圧入リング１１をしっかりと把持することができる。 The cross-sectional shape of the recesses 22a and 23a is precisely a little smaller than a semicircle, and when the press-fitting ring 11 is sandwiched between them as described above, the support arm 22 and the block member 23 are brought into contact with each other. A small gap is formed. Therefore, the press-fitting ring 11 can be firmly held by the support arm 22 and the block member 23 by tightening with the bolt 24 as described above.

また、前記の凹部２２ａ，２３ａにはそれぞれ、圧入リング１１の外周の溝部１１ａに対応して内周の円弧面の幅方向中央部位に、周方向全体に延びる突条２２ｃ，２３ｃが形成されている。この突条２２ｃ，２３ｃの横断面形状は概ね溝部１１ａと同じであり、前記のように圧入リング１１をブロック部材２３及び支持腕２２の各凹部２２ａ，２３ａに挟み込んで把持したときに、これら凹部２２ａ，２３ａの突条２２ｃ，２３ｃが圧入リング１１の溝部１１ａに嵌まり込むようになる。 The recesses 22a and 23a are respectively provided with protrusions 22c and 23c extending in the entire circumferential direction at the center in the width direction of the arc surface on the inner periphery corresponding to the groove 11a on the outer periphery of the press-fitting ring 11. Yes. The cross-sectional shape of the protrusions 22c and 23c is substantially the same as that of the groove portion 11a, and when the press-fitting ring 11 is sandwiched and held between the block member 23 and the recesses 22a and 23a of the support arm 22 as described above, The protrusions 22 c and 23 c of 22 a and 23 a are fitted into the groove 11 a of the press-fitting ring 11.

こうして溝部１１ａが突条２２ｃ，２３ｃと嵌合することによって即ち、対応する凹凸嵌合部が互いに嵌合することにより圧入リング１１は、そのリング軸線ｒ方向の中央部位が正確に支持腕２２の幅方向中央に位置づけられ、換言すれば、圧入リング１１の中心点が、捩り試験機Ａにおける保持部１０１ａ，１０３ａ同士の相対回動軸線Ｒ上に位置づけられ、図４に示すように、そのリング軸線ｒ、つまり該圧入リング１１により把持されるラバーブッシュＢの外筒２０１の筒軸線ｒが、前記の相対回動軸線Ｒと直交するようになる。 Thus, when the groove portion 11a is fitted to the protrusions 22c and 23c, that is, when the corresponding concave and convex fitting portions are fitted to each other, the center portion in the direction of the ring axis r of the press-fitting ring 11 is accurately positioned on the support arm 22. Positioned at the center in the width direction, in other words, the center point of the press-fitting ring 11 is positioned on the relative rotation axis R of the holding portions 101a and 103a in the torsion tester A, and as shown in FIG. The axis r, that is, the cylinder axis r of the outer cylinder 201 of the rubber bush B gripped by the press-fitting ring 11 becomes perpendicular to the relative rotation axis R.

−第３治具−
前記したように固定装置１０１側の保持部１０１ａにラバーブッシュＢの外筒２０１を支持する第２治具２に対して、その内筒２００を支持する第３治具３は可動装置１０３側の保持部１０３ａに装着される。すなわち、前記の図２、４に示すように第３治具３は、保持部１０３ａの端面に重ね合わされてボルト３０，３０，…により締結される横長の長方形板状のベース部３１と、その左右両端からそれぞれ略直交して固定装置１０１側に向かって延びる長方形板状の２つの支持腕３２，３２と、を有している。 -Third jig-
As described above, in contrast to the second jig 2 that supports the outer cylinder 201 of the rubber bush B on the holding portion 101a on the fixing apparatus 101 side, the third jig 3 that supports the inner cylinder 200 is on the movable apparatus 103 side. It is attached to the holding part 103a. That is, as shown in FIGS. 2 and 4, the third jig 3 includes a horizontally long rectangular plate-shaped base portion 31 that is overlapped with the end surface of the holding portion 103a and fastened by bolts 30, 30,. Two support arms 32 and 32 each having a rectangular plate shape extending from the left and right ends substantially orthogonally toward the fixing device 101 side.

そうして保持部１０３ａに装着された状態で、第３治具３の２つの支持腕３２，３２はそれぞれ、前記した第２治具２の支持腕２２の左右両側に概ね保持部１０３ａの半径分、離れて平行に延びている。すなわち、これら２つの支持腕３２，３２の先端側は、前記したように第２治具２の支持腕２２によって圧入リング１１が把持された供試体の芯棒１０の両端部に対応する位置にあり、この両端部にそれぞれ設けられている前記角柱部１２ａ及び立方体部材１４を上下から把持するように、コ字状の把持部が設けられている。 In this state, the two support arms 32 and 32 of the third jig 3 are mounted on the left and right sides of the support arm 22 of the second jig 2 in a state of being mounted on the holding section 103a. Minutes away and extends in parallel. That is, the tip ends of these two support arms 32 and 32 are positioned at positions corresponding to both ends of the core rod 10 of the specimen in which the press-fitting ring 11 is gripped by the support arm 22 of the second jig 2 as described above. In addition, a U-shaped gripping portion is provided so as to grip the prism 12a and the cubic member 14 provided at both ends thereof from above and below.

その把持部は、図５(b)に詳しく示すように、支持腕３２の先端側を上下方向に概略３分の１くらいの厚みを残して矩形状に切り欠き、その下部に残った角棒状の下把持部３３と、これに組み合わせる略同形状の別体の上把持部材３４とからなる。図２、５(b)に示すように、それら上把持部材３４及び下把持部３３の間に前記した芯棒１０の被把持部である角柱部１２ａ及び立方体部材１４を挟んで把持するようになっている（図２には手前側の立方体部材１４が把持される様子が示されている）。 As shown in detail in FIG. 5 (b), the gripping portion is cut out in a rectangular shape with a thickness of about one third of the tip end side of the support arm 32 in the vertical direction, and a rectangular bar shape left below the gripping portion. And a separate upper gripping member 34 having substantially the same shape to be combined therewith. As shown in FIGS. 2 and 5 (b), the prism member 12a and the cubic member 14 which are gripped portions of the core rod 10 are sandwiched between the upper gripping member 34 and the lower gripping portion 33 so as to be gripped. (The state in which the front-side cube member 14 is gripped is shown in FIG. 2).

より詳しくは前記下把持部３３の先端寄り及び基端寄りの部位にはそれぞれ、図５(b)に符号を付して示すように上下に延びるボルト穴３３ａが形成され、これに対応して上把持部材３４にも上下に延びる貫通穴３４ａが形成されている。この貫通穴３４ａに上方からボルト３５を挿通して、その軸の下部を前記ボルト穴３３ａに螺入して締め付ければ、上把持部材３４及び下把持部３３の間に前記角柱部１２ａや立方体部材１４がしっかりと把持される。 More specifically, bolt holes 33a extending in the vertical direction are formed in the portions near the distal end and the proximal end of the lower grip portion 33 as shown in FIG. The upper gripping member 34 is also formed with a through hole 34a extending vertically. If the bolt 35 is inserted into the through-hole 34a from above and the lower part of the shaft is screwed into the bolt hole 33a and tightened, the prismatic part 12a or the cube is interposed between the upper gripping member 34 and the lower gripping part 33. The member 14 is firmly gripped.

こうして支持腕３２の上把持部材３４及び下把持部３３によってそれぞれ把持される、角柱部１２ａ及び立方体部材１４のそれぞれの上面及び下面は互いに平行であり、これらが被把持面である。立方体部材１４は芯棒１０の丸棒部１３ｂの周りに回動可能であるから、前記のように上把持部材３４及び下把持部３３によって把持されれば自ずとその上面及び下面は角柱部１２ａの上面及び下両と平行になる。 Thus, the upper and lower surfaces of the prism portion 12a and the cubic member 14 that are gripped by the upper gripping member 34 and the lower gripping portion 33 of the support arm 32 are parallel to each other, and these are the gripped surfaces. Since the cube member 14 can be rotated around the round bar portion 13b of the core rod 10, the upper surface and the lower surface of the cube member 14a are naturally formed by the upper column member 12a as long as it is gripped by the upper grip member 34 and the lower grip portion 33 as described above. Parallel to both top and bottom.

また、この例では前記図５(b)に示すように立方体部材１４が上下に２分割されて、一対の半割部材１５，１５とされており、これらの突き合わせ面にはそれぞれ、芯棒１０の端部の丸棒部１３ｂに対応する断面半円形状の溝部１５ａが凹み形成されている。そして、それらの半割部材１５，１５同士を突き合わせ、それぞれの溝部１５ａの間に丸棒部１３ｂを挟み込むことで、この丸棒部１３ｂと立方体部材１４との間のガタが少なくなり、試験精度を高める上で有利になる。 Further, in this example, as shown in FIG. 5 (b), the cube member 14 is divided into two in the vertical direction to form a pair of halved members 15 and 15. A core rod 10 is provided on each of these butted surfaces. A groove portion 15a having a semicircular cross section corresponding to the round bar portion 13b at the end is formed as a recess. Then, the half members 15 and 15 are butted against each other, and the round bar portion 13b is sandwiched between the respective groove portions 15a, so that the backlash between the round bar portion 13b and the cube member 14 is reduced. It will be advantageous to increase.

さらにこの例では、前記の角柱部１２ａや立方体部材１４と、これらを把持する支持腕３２の把持部、即ち前記の上把持部材３４及び下把持部３３との間に、焼き入れを施した鋼板からなるスペーサ部材１６が介設されている。これは、抉り試験の際に強い力が加わる把持面や被把持面、即ち前記上把持部材３４の下面及び下把持部３３の上面、並びに前記角柱部１２ａや立方体部材１４の上下面における摩耗を抑制するためである。 Further, in this example, a steel plate that has been quenched between the prism portion 12a and the cubic member 14 and the gripping portion of the support arm 32 that grips them, that is, the upper gripping member 34 and the lower gripping portion 33. A spacer member 16 is provided. This is due to wear on the gripping surface and the gripped surface to which a strong force is applied during the rolling test, that is, the lower surface of the upper gripping member 34 and the upper surface of the lower gripping portion 33, and the upper and lower surfaces of the prism 12 a and the cube member 14. It is for suppressing.

尚、図示は省略するが、前記支持腕３２の上把持部材３４及び下把持部３３にはそれぞれ磁石が埋設されていて、スペーサ部材１６が付着するようになっている。また、この例では前記立方体部材１４の一対の半割部材１５，１５にもそれぞれ磁石が埋設されていて、芯棒１０の丸棒部１３ｂや前記スペーサ部材１６に付着するようになっている。このため、部品点数が増えてもそれらの着脱が容易であり、しかも紛失する心配が少ない。 Although not shown, magnets are embedded in the upper gripping member 34 and the lower gripping portion 33 of the support arm 32 so that the spacer member 16 adheres thereto. In this example, magnets are also embedded in the pair of half members 15, 15 of the cube member 14, and are attached to the round bar portion 13 b of the core rod 10 and the spacer member 16. For this reason, even if the number of parts increases, it is easy to attach and detach them, and there is little fear of losing them.

−抉り試験の手順−
上述した治具Ｊを用いて抉り試験を行うときには、まず、測定するラバーブッシュＢの外筒２０１を圧入リング１１に圧入して把持せしめるとともに、その内筒２００には一端側から芯棒１０の第１部材１２の丸棒部１２ｂを挿入し、それを貫通して反対側に突き出るねじ部１２ｃを第２部材１３のねじ穴１３ｃに螺入して締結する。これにより芯棒１０は、その両端部を突出させた状態でラバーブッシュＢの内筒２００に挿入固定され、前記図３に示す供試体が構成される。 −Burn test procedure−
When performing the rolling test using the jig J described above, first, the outer cylinder 201 of the rubber bush B to be measured is press-fitted into the press-fitting ring 11 and gripped, and the inner cylinder 200 is inserted into the inner cylinder 200 from one end side. The round rod portion 12b of the first member 12 is inserted, and the screw portion 12c that penetrates through the rod 12c and projects to the opposite side is screwed into the screw hole 13c of the second member 13 and fastened. As a result, the core rod 10 is inserted and fixed to the inner cylinder 200 of the rubber bush B in a state in which both ends thereof are projected, and the specimen shown in FIG. 3 is configured.

また、捩り試験機Ａには第２、第３治具２、３を装着する。すなわち、第２治具２のベース部２１を固定装置１０１側の保持部１０１ａの端面に重ね合わせてボルト２０により締結し、同様に第３治具３のベース部３１を可動装置１０３側の保持部１０３ａの端面に重ね合わせて、ボルト３０により締結する。それから前記図４のように供試体の圧入リング１１を第２治具２の支持腕２２に、また、芯棒１０を第３治具３の支持腕３２に、それぞれ取り付けて、供試体、即ちラバーブッシュＢを保持部１０１ａ，１０３ａの間に保持する。 The torsion tester A is equipped with second and third jigs 2 and 3. That is, the base portion 21 of the second jig 2 is overlapped with the end face of the holding portion 101a on the fixing device 101 side and fastened by the bolt 20, and similarly, the base portion 31 of the third jig 3 is held on the movable device 103 side. It overlaps with the end surface of the part 103a and is fastened by the bolt 30. Then, the press-fitting ring 11 of the specimen is attached to the support arm 22 of the second jig 2 and the core rod 10 is attached to the support arm 32 of the third jig 3 as shown in FIG. The rubber bush B is held between the holding portions 101a and 103a.

このとき、まず、供試体の圧入リング１１を第２治具２の支持腕２２の凹部２２ａに嵌め入れて、この凹部２２ａ内の突条２２ｃを圧入リング１１の溝部１１ａと嵌合させる。こうすると、圧入リング１１の中央、即ちこれにより把持されている内筒２００の筒軸線ｒ方向の中央部位が正確に捩り試験機Ａの相対回動軸線Ｒ上に位置づけられ、且つそれら両軸線ｒ，Ｒ同士が直交するようになる。 At this time, first, the press-fitting ring 11 of the specimen is fitted into the recess 22 a of the support arm 22 of the second jig 2, and the protrusion 22 c in the recess 22 a is fitted to the groove 11 a of the press-fitting ring 11. In this way, the center of the press-fitting ring 11, that is, the central portion in the direction of the cylinder axis r of the inner cylinder 200 held thereby is accurately positioned on the relative rotation axis R of the torsion tester A, and both the axes r , R become orthogonal to each other.

この状態で供試体の芯棒１０両端の被把持部、即ち角柱部１２ａと立方体部材１４とはそれぞれ、図示のように第３治具３の各支持腕３２の下把持部３３上に（正確にはスペーサ部材１６の上に）載置される。尚、図において手前側に示す芯棒１０の端部において、丸棒部１３ｂの上側の半割部材１５は仮想線で示している。これは図示のように芯棒１０に外嵌めしておいてもよいし、以下に述べるように後から載せるようにしてもよい。 In this state, the gripped portions at both ends of the core rod 10 of the specimen, that is, the prismatic portion 12a and the cube member 14 are respectively placed on the lower grip portions 33 of the respective support arms 32 of the third jig 3 (exactly as shown in the figure). On the spacer member 16). In addition, in the end part of the core rod 10 shown on the near side in the drawing, the half member 15 on the upper side of the round bar portion 13b is indicated by an imaginary line. This may be externally fitted to the core rod 10 as shown, or may be placed later as described below.

そして、前記第２治具２の支持腕２２には上方からブロック部材２３を取り付けてボルト２４により締結し、供試体の圧入リング１１をしっかりと把持する。また、第３治具３の各支持腕３２にも下把持部３３に上方から上把持部材３４を取り付ける。すなわち、芯棒１０の一方（図の奥側）の端部においては角柱部１２ａを上から把持するように上把持部材３４を取り付け、他方（図の手前側）の端部においては丸棒部１３ｂの上に立方体部材１４の半割部材１５を載せて、その上から上把持部材３４を取り付ける。 Then, a block member 23 is attached to the support arm 22 of the second jig 2 from above and fastened with a bolt 24 to firmly hold the press-fitting ring 11 of the specimen. In addition, the upper gripping member 34 is attached to the lower gripping portion 33 from above on each support arm 32 of the third jig 3. That is, the upper gripping member 34 is attached so as to grip the prism portion 12a from above at one end (back side in the figure) of the core bar 10, and the round bar portion at the other end (front side in the figure). The half member 15 of the cubic member 14 is placed on 13b, and the upper gripping member 34 is attached thereto.

それから、各上把持部材３４の貫通穴３４ａにボルト３５を挿入し、その軸の下部を下把持部３３のボルト穴３３ａに螺入して締め付ける。これにより前記芯棒１０の角柱部１２ａ及び立方体部材１４が上把持部材３４と下把持部３３との間にしっかりと把持される。このとき角柱部１２ａの上下両面及び立方体部材１４の上下両面は全て平行になっているので、仮にラバーブッシュＢの筒軸線ｒに対して内筒２００が斜めになっていても、これを貫通する芯棒１０を問題なく把持して、捩り試験機Ａに取り付けることができる。 Then, the bolt 35 is inserted into the through hole 34 a of each upper gripping member 34, and the lower portion of the shaft is screwed into the bolt hole 33 a of the lower gripping portion 33 and tightened. As a result, the prism 12 a and the cube member 14 of the core rod 10 are firmly held between the upper holding member 34 and the lower holding portion 33. At this time, since both the upper and lower surfaces of the prism portion 12a and the upper and lower surfaces of the cube member 14 are parallel to each other, even if the inner cylinder 200 is inclined with respect to the cylinder axis r of the rubber bush B, it passes therethrough. The core rod 10 can be gripped without problems and attached to the torsion tester A.

そうしてラバーブッシュＢの供試体を第１〜第３治具１〜３によって保持部１０１ａ，１０３ａの間に保持し、固定装置１０１内の電動モータを作動させて保持部１０１ａを予め設定した周期及び振幅で正転側、逆転側に交互に回動させれば、この保持部１０１ａと他方の保持部１０３ａとの間のラバーブッシュＢには正逆方向の抉り負荷が交互に加わるようになり、その状態で角変位やトルクの検出値のデータを採取してラバーブッシュＢの抉りについての動特性を調べることができる。 Then, the specimen of the rubber bush B is held between the holding portions 101a and 103a by the first to third jigs 1 to 3, and the electric motor in the fixing device 101 is operated to preset the holding portion 101a. By alternately rotating the forward rotation side and the reverse rotation side with the period and the amplitude, the rolling load in the forward / reverse direction is alternately applied to the rubber bush B between the holding portion 101a and the other holding portion 103a. In this state, the data of the detected values of angular displacement and torque can be collected, and the dynamic characteristics of the rubber bush B can be examined.

したがって、この実施形態の治具Ｊを用いれば、汎用の捩り試験機Ａに適切な状態でラバーブッシュＢを取り付けて抉り試験を容易に且つ精度よく行うことができる。ラバーブッシュＢの外筒２０１の筒軸線ｒ（或いは外周の中心線）に対して内筒２００が斜めになっている場合でも、また、その傾斜度合いが異なっていても第３治具３による芯棒１０の端部の把持位置が少し変わるだけであり、治具の交換が不要で徒に作業負担や試験コストが増大することはない。 Therefore, when the jig J of this embodiment is used, the rubber bush B can be attached to the general-purpose torsion tester A in an appropriate state, and the rolling test can be easily and accurately performed. Even when the inner cylinder 200 is inclined with respect to the cylinder axis r (or the center line of the outer periphery) of the outer cylinder 201 of the rubber bush B, and even if the inclination is different, the core by the third jig 3 is used. The gripping position of the end of the rod 10 is only slightly changed, and there is no need to replace the jig, and the work load and test cost are not increased.

また、この実施形態では前記のように供試体の圧入リング１１を支持する第２治具２において、その支持腕２２及びブロック部材２３の凹部２２ａ，２３ａに突条２２ｃ，２３ｃを設けて、圧入リング１１の外周の溝部１１ａと嵌合させることにより、特段の位置合わせ不要で供試体のラバーブッシュＢの外筒２０１を、その筒軸線ｒ方向の中央位置が相対回動軸線Ｒ上に位置するように支持できる。 Further, in this embodiment, in the second jig 2 for supporting the press-fitting ring 11 of the specimen as described above, the protrusions 22c and 23c are provided in the recesses 22a and 23a of the support arm 22 and the block member 23, thereby press-fitting. By fitting with the groove 11a on the outer periphery of the ring 11, the center position of the outer cylinder 201 of the rubber bush B of the specimen is positioned on the relative rotation axis R without any special alignment. Can be supported.

図６に示すグラフは、前記の支持腕２２及びブロック部材２３に突条２２ｃ，２３ｃを設けない第２治具２を試作して、これにより支持する供試体の位置をラバーブッシュＢの筒軸線ｒ方向にずらしつつ試験を行った結果であり、ラバーブッシュＢの筒軸線ｒ方向の位置ずれ（センターずれ）と、計算した抉り静ばね定数の値との関係を示している。このグラフから両者には明らかに相関があり、センターずれをなくすことによって試験精度が向上することが分かる。 The graph shown in FIG. 6 shows a prototype of the second jig 2 in which the protrusions 22c and 23c are not provided on the support arm 22 and the block member 23, and the position of the specimen to be supported thereby is determined by the cylinder axis of the rubber bush B. This is a result of a test conducted while shifting in the r direction, and shows the relationship between the positional deviation (center deviation) of the rubber bush B in the cylinder axis r direction and the calculated value of the static spring constant. From this graph, there is a clear correlation between the two, and it can be seen that the test accuracy is improved by eliminating the center shift.

さらに、この実施形態では、抉り試験を行うときに強い力がかかる芯棒１０の両端部の被把持部、即ち角柱部１２ａ及び立方体部材１４の大きさを、いずれもラバーブッシュＢの内筒２００よりも大きくしており、こうして被把持面を或る程度以上の大きさとすることで摩耗を抑制できる上に、それらの被把持面には焼き入れ鋼板からなるスペーサ部材１６を介在させており、これにより十分な耐久性を確保することができる。 Furthermore, in this embodiment, the sizes of the gripped portions at both ends of the core rod 10 to which a strong force is applied during the rolling test, that is, the prismatic portion 12a and the cube member 14, are both the inner cylinder 200 of the rubber bush B. In addition to being able to suppress wear by making the gripped surface larger than a certain size in this way, the spacer member 16 made of a hardened steel plate is interposed on the gripped surface, Thereby, sufficient durability can be ensured.

尚、本発明に係る治具Ｊの構成は前記の実施の形態に限定されず、それ以外の種々の構成をも包含する。例えば、第１治具１の芯棒１０は２つに分割しなくてもよいし、その他方の端部に外嵌めする立方体部材１４も半割状の部材１５に分割する必要はない。また、スペーサ部材１６を設けないことも可能である。 In addition, the structure of the jig | tool J which concerns on this invention is not limited to the said embodiment, Various structures other than that are included. For example, the core rod 10 of the first jig 1 does not have to be divided into two, and the cube member 14 that is externally fitted to the other end portion does not need to be divided into the half-shaped member 15. It is also possible not to provide the spacer member 16.

また、第２治具２の支持腕２２やブロック部材２３に突条２２ｃ，２３ｃを設けず、圧入リング１１にも溝部１１ａを設けないこともできるが、この場合には正確な位置合わせが面倒であり、作業者によるバラツキも懸念されるので、前記突条２２ｃ，２３ｃ及び溝部１１ａによる凹凸嵌合構造は採用することが望ましい。 Further, the protrusions 22c and 23c may not be provided on the support arm 22 or the block member 23 of the second jig 2, and the groove 11a may not be provided on the press-fitting ring 11. However, in this case, accurate positioning is troublesome. In addition, since there is a concern about variations due to the operator, it is desirable to employ the concave / convex fitting structure by the protrusions 22c and 23c and the groove 11a.

Ａ捩り試験器（特性試験装置）
Ｒ相対回動軸線
１０１ａ、１０３ａ一対の保持部
Ｂラバーブッシュ
ｒ筒軸線
２００内筒
２０１外筒
Ｊ特性試験装置用治具
１第１治具
１０芯棒（内筒支持部材）
１１圧入リング（外周把持部材）
１１ａ溝部（凹凸嵌合部）
１２第１部材（一方の分割部材）
１２ａ角柱部（被把持部）
１３第２部材（他方の分割部材）
１３ｂ丸棒部（丸棒状の端部）
１４立方体部材（別体部材）
１５半割部材
１５ａ溝部
２第２治具
２１ベース部
２２支持腕
２２ｃ突条（凹凸嵌合部）
２３ブロック部材（支持腕）
２３ｃ突条（凹凸嵌合部）
３第３治具
３２支持腕
３３下把持部
３４上把持部材
１６スペーサ部材 A Torsion tester (characteristic test equipment)
R Relative rotation axis 101a, 103a A pair of holding parts B Rubber bush r Cylinder axis 200 Inner cylinder 201 Outer cylinder J Jig for characteristic test device 1 First jig 10 Core rod (inner cylinder support member)
11 Press-fit ring (peripheral gripping member)
11a Groove (concave part)
12 1st member (one division member)
12a Rectangular column (gripped part)
13 Second member (the other divided member)
13b Round bar (round bar-shaped end)
14 Cubic member (separate member)
15 Half member 15a Groove part 2 Second jig 21 Base part 22 Support arm 22c Projection (concave fitting part)
23 Block member (support arm)
23c Projection (concave part)
3 Third jig 32 Support arm 33 Lower gripping portion 34 Upper gripping member 16 Spacer member

Claims

A jig for a characteristic test apparatus that holds a rubber bush between a pair of opposing holding parts and performs a characteristic test by rotating the holding parts relative to each other around a predetermined axis.
A first jig comprising a rod-shaped inner cylinder support member inserted and fixed to an inner cylinder of the rubber bush so that both end portions thereof protrude, and a cylindrical outer periphery gripping member for gripping the outer periphery of the rubber bush. When,
The outer periphery gripping member is supported by a support arm attached to one holding part of the characteristic test apparatus and extending toward the other holding part so that the cylinder axis and the relative rotation axis of the holding parts intersect each other. A second jig to
A third jig that is attached to the other holding portion and that supports both end portions of the inner cylinder support member by two support arms that extend toward the one holding portion,
A gripped portion having a pair of gripped surfaces parallel to each other is provided at both ends in the longitudinal direction of the inner cylinder support member, and the gripped portions are relatively rotated around the axis of the inner cylinder support member. While it is considered movable,
Each of the two support arms of the third jig is provided with a U-shaped gripping part for gripping each gripped part at both ends of the inner cylinder support member. A rubber bushing characteristic testing device jig characterized by gripping a gripping portion and positioning all of the gripped surfaces in parallel.

The inner cylinder support member is divided into two members in the longitudinal direction, and the gripped portion is integrally formed at the end of one of the split members, while the end of the other split member has a round bar shape. The characteristic test apparatus jig according to claim 1, wherein a separate member is externally fitted so as to be relatively rotatable, and a gripped portion is formed on the separate member.

The separate member is composed of a pair of halved members that are abutted against each other, and each abutment surface of each of the halved members has a groove portion having a substantially semicircular cross section corresponding to the round bar-shaped end portion of the inner cylinder support member. The jig for a characteristic test apparatus according to claim 2, wherein the jig is formed as a recess.

The spacer member which consists of a hardened steel plate is interposed between the holding part of each of the two support arms of the third jig and the gripped part of the inner cylinder support member, respectively. The jig for a characteristic test apparatus according to any one of the above.

The characteristic according to any one of claims 2 to 4, wherein a magnet is embedded in at least one of the gripping portion of the support arm of the third jig, the round bar-shaped end portion of the inner cylinder support member, and the separate member. Jig for testing equipment.

The support arm of the second jig is configured to grip the outer periphery of the outer periphery holding member of the first jig,
The uneven | corrugated fitting part is provided in any one of Claims 1-5 so that it may mutually fit in the outer peripheral surface of the said outer periphery holding member, and the holding surface of the said support arm contact | abutted to this. Jig for characteristic testing equipment.