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JP2014126109A - Tapered snap ring - Google Patents

Tapered snap ring Download PDF

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Publication number
JP2014126109A
JP2014126109A JP2012282699A JP2012282699A JP2014126109A JP 2014126109 A JP2014126109 A JP 2014126109A JP 2012282699 A JP2012282699 A JP 2012282699A JP 2012282699 A JP2012282699 A JP 2012282699A JP 2014126109 A JP2014126109 A JP 2014126109A
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Japan
Prior art keywords
snap ring
taper
taper snap
convex portion
axial direction
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Pending
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JP2012282699A
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Japanese (ja)
Inventor
Hirotada Yanagimoto
広忠 柳本
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NSK Ltd
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NSK Ltd
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Priority to JP2012282699A priority Critical patent/JP2014126109A/en
Publication of JP2014126109A publication Critical patent/JP2014126109A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
    • F16C35/04—Rigid support of bearing units; Housings, e.g. caps, covers in the case of ball or roller bearings
    • F16C35/06—Mounting or dismounting of ball or roller bearings; Fixing them onto shaft or in housing
    • F16C35/067—Fixing them in a housing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B21/00—Means for preventing relative axial movement of a pin, spigot, shaft or the like and a member surrounding it; Stud-and-socket releasable fastenings
    • F16B21/10—Means for preventing relative axial movement of a pin, spigot, shaft or the like and a member surrounding it; Stud-and-socket releasable fastenings by separate parts
    • F16B21/16—Means for preventing relative axial movement of a pin, spigot, shaft or the like and a member surrounding it; Stud-and-socket releasable fastenings by separate parts with grooves or notches in the pin or shaft
    • F16B21/18—Means for preventing relative axial movement of a pin, spigot, shaft or the like and a member surrounding it; Stud-and-socket releasable fastenings by separate parts with grooves or notches in the pin or shaft with circlips or like resilient retaining devices, i.e. resilient in the plane of the ring or the like; Details
    • F16B21/183—Means for preventing relative axial movement of a pin, spigot, shaft or the like and a member surrounding it; Stud-and-socket releasable fastenings by separate parts with grooves or notches in the pin or shaft with circlips or like resilient retaining devices, i.e. resilient in the plane of the ring or the like; Details internal, i.e. with spreading action
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2300/00—Application independent of particular apparatuses
    • F16C2300/02—General use or purpose, i.e. no use, purpose, special adaptation or modification indicated or a wide variety of uses mentioned

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Snaps, Bayonet Connections, Set Pins, And Snap Rings (AREA)
  • Mounting Of Bearings Or Others (AREA)

Abstract

【課題】軸受外輪からテーパスナップリングにアキシャル荷重が負荷されるとテーパ部に発生する反力の径方向分力によってテーパスナップリングを縮径しようとする作用が働く。
【解決手段】本発明に係るテーパスナップリングにおいては、被固定物である軸受等と接触する部分に凸部を設けたことを特徴とする。軸受にアキシャル荷重が負荷された場合、テーパスナップリングの反テーパ側端面では、前記凸部と軸受外輪の面取り部が接触する。この接触点に作用する力の径方向分力はテーパスナップリングを拡径させる力となり、アキシャル荷重によるテーパスナップリングの縮径が抑制される。その結果、テーパスナップリングの荷重負担能力を増加させることができる。
【選択図】図１When an axial load is applied from a bearing outer ring to a taper snap ring, an action to reduce the diameter of the taper snap ring is performed by a radial component of a reaction force generated in a taper portion.
A taper snap ring according to the present invention is characterized in that a convex portion is provided at a portion in contact with a bearing or the like as a fixed object. When an axial load is applied to the bearing, the convex portion and the chamfered portion of the bearing outer ring come into contact with each other at the end surface on the non-taper side of the taper snap ring. The radial component of the force acting on the contact point becomes a force for expanding the taper snap ring, and the diameter reduction of the taper snap ring due to the axial load is suppressed. As a result, the load bearing capacity of the taper snap ring can be increased.
[Selection] Figure 1

Description

この発明は、転がり軸受等をハウジング等に固定するために用いるテーパスナップリングに関する。   The present invention relates to a taper snap ring used for fixing a rolling bearing or the like to a housing or the like.

スナップリングは、転がり軸受等の被固定物をハウジングに固定する際の位置決めや抜け止め用として多く用いられている。図６に従来のテーパスナップリング２を用いて転がり軸受１３をハウジング１１に固定した状態を示す。テーパスナップリング２は止め輪溝１２の中で自身の弾性力によって拡径しようとするため、テーパ面に作用する力の軸方向成分が軸受外輪１４を軸方向に押圧し、転がり軸受１３をハウジング１１に固定する効果が発揮される。反面、軸受外輪５から軸方向の荷重Ｆが負荷されるとテーパスナップリング２のテーパ部に反力ｆａが発生し、ｆａの径方向分力ｆｂによってテーパスナップリング２を縮径しようとする作用が働く。   Snap rings are often used for positioning and retaining when a fixed object such as a rolling bearing is fixed to a housing. FIG. 6 shows a state in which the rolling bearing 13 is fixed to the housing 11 using the conventional taper snap ring 2. Since the taper snap ring 2 tries to expand its diameter by its own elastic force in the retaining ring groove 12, the axial component of the force acting on the tapered surface presses the bearing outer ring 14 in the axial direction, and the rolling bearing 13 is housed in the housing. The effect of fixing to 11 is exhibited. On the other hand, when an axial load F is applied from the bearing outer ring 5, a reaction force fa is generated in the tapered portion of the taper snap ring 2, and the taper snap ring 2 is reduced in diameter by the radial component force fb of fa. Work.

この部分の改善の先行技術としては、特許文献１にあるように針状転がり軸受の位置決めや抜け止め用として、軸受穴用スナップリングのフック部と略等しい巾及び前記スナップリングと略等しい厚さを有するロック部材を、止め輪溝に嵌装状態の前記スナップリングの前記フック部に挿入し、前記ロック部材の脚部を前記止め輪溝内にて拡開させ、前記スナップリングの前記フック部に圧着し得るようにした発明がある。また、特許文献２には、静止摩擦係数を考慮したテーパ角を設けたスナップリングが記載されている。   As a prior art for improving this portion, as disclosed in Patent Document 1, for positioning and retaining of a needle-shaped rolling bearing, a width substantially equal to a hook portion of a snap ring for a bearing hole and a thickness substantially equal to the snap ring A locking member having a locking ring is inserted into the hook portion of the snap ring fitted in a retaining ring groove, and a leg portion of the locking member is expanded in the retaining ring groove, and the hook portion of the snap ring is There is an invention that can be pressure-bonded. Patent Document 2 describes a snap ring provided with a taper angle in consideration of the coefficient of static friction.

実開平６−１４５２３号公報Japanese Utility Model Publication No. 6-14523 特開平７−２１７６２４号公報JP 7-217624 A

しかしながら、特許文献１の発明はスナップリングの他にロック部材が必要なため、製造コストや組立工数が増加する虞がある。また、特許文献２に記載の発明は角度を規定したテーパ面を設けることでスナップリングの抜け防止に対しては効果はあるが、その効果がハウジングの摩擦係数に依存することから、ハウジングの材質や表面の仕上げ状態に荷重負担能力が左右されるという問題がある。本発明は、上記課題に鑑みてなされたものであり、ハウジングから抜けにくく、かつ部品点数が増えないためコストの上昇や組立工数の増加を抑制したテーパスナップリングを提供することを目的とする。   However, since the invention of Patent Document 1 requires a lock member in addition to the snap ring, there is a risk that the manufacturing cost and the number of assembly steps may increase. In addition, the invention described in Patent Document 2 is effective in preventing the snap ring from falling off by providing a tapered surface with a specified angle, but the effect depends on the coefficient of friction of the housing. In addition, there is a problem in that the load bearing capacity is affected by the finished state of the surface. The present invention has been made in view of the above problems, and an object of the present invention is to provide a taper snap ring which is difficult to be removed from the housing and does not increase the number of parts and suppresses an increase in cost and an increase in assembly man-hours.

上記の目的を達成するため、本発明は、転がり軸受等の被固定物をハウジングに固定することを目的としたテーパスナップリングにおいて、テーパスナップリングの反テーパ側端面の被固定物と接触する部分に凸部を設けたことを特徴とする。   In order to achieve the above object, the present invention provides a taper snap ring for fixing a fixed object such as a rolling bearing to a housing, and a portion in contact with the fixed object on the end surface on the non-taper side of the taper snap ring. It is characterized in that a convex portion is provided on.

被固定物を固定するテーパスナップリングに軸方向の荷重（以下「アキシャル荷重」と呼ぶ）Ｆが負荷された状態において、テーパスナップリングのテーパ面と止め輪溝の接触点に作用する反力は軸方向と径方向の２つの分力に分けて考えることができる。軸方向分力はアキシャル荷重Ｆと対抗し、打ち消しあうが、径方向分力はテーパスナップリングを縮径させる力となる。
本発明に係るテーパスナップリングにおいては、被固定物である転がり軸受等と接触する部分に凸部を設けたことを特徴とする。本発明に係るテーパスナップリングによってハウジングに固定された軸受にアキシャル荷重が負荷された場合、前記テーパスナップリングの反テーパ側端面では、前記凸部と軸受外輪の面取り部が接触する。この接触点に作用する力は軸方向と径方向の２つの分力に分けて考えることができ、径方向の分力は前記テーパスナップリングを拡径させる力となるため、アキシャル荷重による前記テーパスナップリングの縮径作用が抑制される。その結果、前記テーパスナップリングの荷重負担能力が増加する。 In the state where an axial load (hereinafter referred to as “axial load”) F is applied to the taper snap ring for fixing the object to be fixed, the reaction force acting on the contact point between the taper surface of the taper snap ring and the retaining ring groove is It can be divided into two component forces in the axial direction and the radial direction. The axial component force counteracts and cancels the axial load F, but the radial component force is a force that reduces the diameter of the taper snap ring.
The taper snap ring according to the present invention is characterized in that a convex portion is provided at a portion in contact with a rolling bearing or the like that is a fixed object. When an axial load is applied to the bearing fixed to the housing by the taper snap ring according to the present invention, the convex portion and the chamfered portion of the bearing outer ring come into contact with each other on the end surface on the non-taper side of the taper snap ring. The force acting on the contact point can be divided into two component forces in the axial direction and the radial direction. Since the radial component force is a force for expanding the taper snap ring, the taper due to the axial load is increased. The diameter reduction effect of the snap ring is suppressed. As a result, the load bearing capacity of the taper snap ring is increased.

本発明に係るテーパスナップリングをハウジングに装着した状態を模式的に示した断面図である。It is sectional drawing which showed typically the state which mounted | wore the housing with the taper snap ring which concerns on this invention. 本発明に係るテーパスナップリングの正面図を示した図面である。It is drawing which showed the front view of the taper snap ring which concerns on this invention. 本発明に係るテーパスナップリングの図２におけるＡ−Ａ断面での断面図を示した図面である。It is drawing which showed sectional drawing in the AA cross section in FIG. 2 of the taper snap ring which concerns on this invention. 本発明に係るテーパスナップリングにアキシャル荷重が負荷された際に発生する反力を示した断面図である。It is sectional drawing which showed the reaction force generate | occur | produced when an axial load is loaded on the taper snap ring which concerns on this invention. テーパ面と凸部にそれぞれ作用する力の方向を模式的に示す図面である。It is drawing which shows typically the direction of the force which acts on a taper surface and a convex part, respectively. 従来のテーパスナップリングをハウジングに装着した状態を模式的に示した断面図である。It is sectional drawing which showed typically the state which mounted | wore the housing with the conventional taper snap ring.

本発明の実施の形態について図面を参照しつつ、詳細に説明する。
図１は本発明に係るテーパスナップリング１をハウジング７に装着した状態を示す。テーパスナップリング１をハウジング７に取り付ける場合は、まず専用工具等を用いて前記テーパスナップリング１の外径を縮小させた状態にした上で前記ハウジング７に挿入する。前記テーパスナップリング１が前記ハウジング７に設けられた凹状断面の止め輪溝９の位置に達すると外径を拡大させて工具を外す。 Embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 shows a state in which a taper snap ring 1 according to the present invention is mounted on a housing 7. When attaching the taper snap ring 1 to the housing 7, first, the outer diameter of the taper snap ring 1 is reduced using a dedicated tool or the like, and then inserted into the housing 7. When the taper snap ring 1 reaches the position of the retaining ring groove 9 having a concave cross section provided in the housing 7, the outer diameter is enlarged and the tool is removed.

前記止め輪溝９に嵌挿された前記テーパスナップリング１は、バネ力が径方向外側に作用して自分自身を拡径しようとする。その際、前記テーパスナップリング１のテーパ面１ａと前記止め輪溝９のテーパ面６の間に発生する楔の作用により前記テーパスナップリング１が軸受外輪５を軸方向に押圧し、転がり軸受４を軸方向に隙間無く固定する。   The taper snap ring 1 inserted in the retaining ring groove 9 tries to expand itself by a spring force acting radially outward. At that time, the taper snap ring 1 presses the bearing outer ring 5 in the axial direction by the action of a wedge generated between the taper surface 1 a of the taper snap ring 1 and the taper surface 6 of the retaining ring groove 9. Is fixed in the axial direction without gaps.

ハウジング７に装着された前記テーパスナップリング１に前記外輪５からアキシャル荷重Ｆが負荷された場合、図４に示すように前記テーパスナップリング１のハウジング側斜面１ａに発生する反力Ｆａの径方向分力Ｆｂによって前記テーパスナップリング１を縮径させようとする作用が働く。   When an axial load F is applied from the outer ring 5 to the taper snap ring 1 mounted on the housing 7, as shown in FIG. 4, the radial direction of the reaction force Fa generated on the housing-side inclined surface 1a of the taper snap ring 1 An action to reduce the diameter of the taper snap ring 1 works by the component force Fb.

しかし本発明に係るテーパスナップリング１は、図１に示すように前記外輪５と接触する部分に凸部３を設けたことを特徴としており、前記転がり軸受４に前記アキシャル荷重Ｆが負荷された場合、前記凸部３と前記外輪５の面取り部１０が接触する。図４に示すように、この接触点に作用する力Ｆｃは軸方向と径方向の２つの分力に分けて考えることができ、径方向の分力Ｆｄはテーパスナップリング１を拡径させる力となる。Ｆｄは前記テーパスナップリング１を縮径させようとする前記径方向分力Ｆｂを相殺するため、前記アキシャル荷重Ｆによる前記テーパスナップリング１の縮径作用が抑制される。そのため、前記テーパスナップリング１が前記止め輪溝９から抜けにくくなり、前記転がり軸受４のアキシャル荷重負担能力が増加する。   However, the taper snap ring 1 according to the present invention is characterized in that a convex portion 3 is provided in a portion in contact with the outer ring 5 as shown in FIG. 1, and the axial load F is applied to the rolling bearing 4. In this case, the convex portion 3 and the chamfered portion 10 of the outer ring 5 come into contact with each other. As shown in FIG. 4, the force Fc acting on the contact point can be divided into two component forces in the axial direction and the radial direction, and the radial component force Fd is a force for expanding the taper snap ring 1. It becomes. Since Fd cancels the radial component force Fb that attempts to reduce the diameter of the taper snap ring 1, the diameter reducing action of the taper snap ring 1 due to the axial load F is suppressed. Therefore, the taper snap ring 1 is difficult to come off from the retaining ring groove 9, and the axial load bearing capacity of the rolling bearing 4 is increased.

前記凸部３の断面形状は図３に示すように半円形が望ましい。更に、前記凸部３と前記面取り部１０との接触点における前記凸部３の法線が軸方向と成す角度をαとし、前記テーパ面１ａと前記テーパ面６との接触点における前記テーパ面１ａの法線と軸方向が成す角度をβとすると、α≧βとなるような位置に前記凸部３を設けることが望ましい（図５参照）。前記径方向分力Ｆｄは前記接触角αの正弦に比例するため、α≧βの関係とすれば前記径方向分力Ｆｄが前記径方向分力Ｆｂよりも大きくなり、アキシャル荷重Ｆによる前記テーパスナップリング１の縮径作用を抑制する効果が高まる。また、被固定物に面取り部１０が存在せず、前記凸部３との接触部が角張っていた場合であっても、その接触点において上記α≧βの関係が成立する位置に前記凸部３を配置すれば良い。   The cross-sectional shape of the convex portion 3 is preferably a semicircular shape as shown in FIG. Further, the angle formed by the normal of the convex portion 3 at the contact point between the convex portion 3 and the chamfered portion 10 with the axial direction is α, and the tapered surface at the contact point between the tapered surface 1a and the tapered surface 6 If the angle formed by the normal line 1a and the axial direction is β, it is desirable to provide the convex portion 3 at a position where α ≧ β (see FIG. 5). Since the radial component force Fd is proportional to the sine of the contact angle α, if the relationship α ≧ β is satisfied, the radial component force Fd is larger than the radial component force Fb, and the taper due to the axial load F is increased. The effect of suppressing the diameter reducing action of the snap ring 1 is enhanced. Further, even when the chamfered portion 10 does not exist in the fixed object and the contact portion with the convex portion 3 is angular, the convex portion is located at a position where the relationship of α ≧ β is established at the contact point. 3 may be arranged.

図２に示すように、前記凸部３は少なくとも開口部側の先端近傍に設ける。また、前記テーパスナップリング１の左右の対称性を保つよう設ける。前記凸部３は前記テーパスナップリング１の全周に亘って設けても良い。または前記凸部３は前記テーパスナップリング１の円周方向に間欠的に設けても良いが、その場合であっても前記テーパスナップリング１の左右対称性を保つよう設ける。   As shown in FIG. 2, the convex portion 3 is provided at least near the tip on the opening side. Further, the taper snap ring 1 is provided so as to maintain left-right symmetry. The convex portion 3 may be provided over the entire circumference of the taper snap ring 1. Alternatively, the convex portion 3 may be provided intermittently in the circumferential direction of the tapered snap ring 1, but even in that case, the convex portion 3 is provided so as to maintain the left-right symmetry of the tapered snap ring 1.

また、本発明は部品点数がテーパスナップリングのみであることや、一般的にテーパスナップリングは鍛造にて製作するため、凸部３を形成することが容易であることなどから、製造コストの大きな増加を招くことなく本発明の実施が可能である。また、本発明に係るテーパスナップリングは材料として一般的なスナップリングと同様に炭素工具鋼、ばね鋼、ステンレス鋼などを利用することができるので、材料コストの上昇も抑制することができる。   Further, in the present invention, since the number of parts is only a taper snap ring, and since the taper snap ring is generally manufactured by forging, it is easy to form the convex portion 3, and thus the manufacturing cost is high. The present invention can be implemented without causing an increase. Further, since the taper snap ring according to the present invention can use carbon tool steel, spring steel, stainless steel and the like as a general snap ring as a material, an increase in material cost can be suppressed.

１ 本発明に係るテーパスナップリング
１ａ テーパ面
１ｂ 反テーパ側端面
２ 従来のテーパスナップリング
２ａ テーパ面
３ 凸部
４ １３ 転がり軸受
５ １４ 軸受外輪
６ ハウジングのテーパ面
７ １１ ハウジング
９、１２ 止め輪溝
１０、１５ 軸受外輪の面取り部
Ｆ アキシャル荷重
Ｆａ、ｆａ テーパスナップリングのテーパ面に発生する反力
Ｆｂ 反力Ｆａの径方向分力
ｆｂ 反力ｆａの径方向分力
Ｆｃ テーパスナップリングの凸部に発生する力
Ｆｄ 反力Ｆｃの径方向分力 DESCRIPTION OF SYMBOLS 1 Tapered snap ring which concerns on this invention 1a Tapered surface 1b Counter taper side end surface 2 Conventional taper snap ring 2a Tapered surface 3 Convex part 4 13 Rolling bearing 5 14 Bearing outer ring 6 Tapered surface of housing 7 11 Housing 9, 12 Retaining ring groove 10, 15 Chamfered portion of bearing outer ring F Axial load Fa, fa Reaction force generated on tapered surface of taper snap ring Fb Radial component force of reaction force Fa fb Radial component force of reaction force fa Fc Convex portion of taper snap ring Force generated in Fd Radial component of reaction force Fc

Claims (5)

ハウジング等の内周面に形成した凹状の止め輪溝に嵌挿されることで転がり軸受等の被固定物を軸方向に固定するテーパスナップリングにおいて、テーパ面を設けた端面の軸方向反対側の端面であって被固定物の面取り部と接触する位置に凸部を設けたことを特徴とするテーパスナップリング。   In a taper snap ring that fixes an object to be fixed such as a rolling bearing in the axial direction by being inserted into a concave retaining ring groove formed on the inner peripheral surface of the housing or the like, the end surface provided with the tapered surface is opposite to the axial direction. A taper snap ring, characterized in that a convex portion is provided at a position that is an end face and is in contact with a chamfered portion of an object to be fixed. 凸部と面取り部との接触点における凸部の法線が軸方向と成す角度をαとし、テーパスナップリングのテーパ面の法線と軸方向が成す角度をβとした場合にα≧βとなるような位置に凸部を設けたことを特徴とする請求項１に記載のテーパスナップリング。   Α ≧ β, where α is the angle formed by the normal of the convex portion at the contact point between the convex portion and the chamfered portion and the axial direction, and β is the angle formed by the normal of the tapered surface of the taper snap ring and the axial direction. The taper snap ring according to claim 1, wherein convex portions are provided at such positions. 前記凸部の軸方向断面が半円形状となっていることを特徴とする請求項１または２に記載のテーパスナップリング。   The taper snap ring according to claim 1 or 2, wherein the convex section has a semicircular cross section in the axial direction. 前記凸部をテーパスナップリングの略全周に亘って設けたことを特徴とする請求項１から３に記載のテーパスナップリング。   The taper snap ring according to claim 1, wherein the convex portion is provided over substantially the entire circumference of the taper snap ring. 前記凸部をテーパスナップリングの開口部側の先端近傍に設けたことを特徴とする請求項１から３に記載のテーパスナップリング。   The taper snap ring according to claim 1, wherein the convex portion is provided in the vicinity of a tip on the opening side of the taper snap ring.
JP2012282699A 2012-12-26 2012-12-26 Tapered snap ring Pending JP2014126109A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200106697A (en) * 2019-03-05 2020-09-15 서한산업(주) Constant joint assembly

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200106697A (en) * 2019-03-05 2020-09-15 서한산업(주) Constant joint assembly
KR102169722B1 (en) * 2019-03-05 2020-10-23 서한산업(주) Constant joint assembly

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