JP4211552B2 - Bush structure - Google Patents
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- JP4211552B2 JP4211552B2 JP2003337374A JP2003337374A JP4211552B2 JP 4211552 B2 JP4211552 B2 JP 4211552B2 JP 2003337374 A JP2003337374 A JP 2003337374A JP 2003337374 A JP2003337374 A JP 2003337374A JP 4211552 B2 JP4211552 B2 JP 4211552B2
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Description
本発明は、内筒と外筒の間に配置され両筒を結合する弾性体を有するブッシュを用いたブッシュ構造に関する。 The present invention relates to a bush structure using a bush having an elastic body which is disposed between an inner cylinder and an outer cylinder and couples both cylinders.
従来から、筒状の部材である内筒と、内筒よりも径の大きな外筒からなる２重筒構造を有し、内筒と外筒の間に加硫成形により両筒を結合するゴム弾性体が介在されているゴムブッシュが広く知られている。この種のゴムブッシュにおいて、内筒の軸方向両端部に外筒の径よりも大きな径の拡径部を形成することで、ゴム弾性体に破断等が生じた場合にも外筒から内筒の抜脱を防止することができる技術が知られている（例えば、特許文献１参照）。
ところで、ゴムブッシュを介した締結構造では、一般的に、ゴムブッシュがサスペンションアームのような被支持部材の貫通穴に圧入され、被支持部材と支持部材（例えば、サスペンションブラケット）とが、ゴムブッシュの内筒内に挿通されるピンやボルト等により結合されている。このような締結構造において、上述の従来技術のように内筒の端部に拡径部を形成する場合、拡径部を被支持部材の貫通穴の両端から露出させる必要がある。即ち、ゴムブッシュの軸方向の長さは、被支持部材の貫通穴の軸方向の長さよりも大きくなければならない。このため、被支持部材の貫通穴の軸方向の長さによってはゴムブッシュの軸方向の長さを必要以上に大きくしなければならず、ゴムブッシュの大型化及び質量増加を招くという問題点が生じうる。 By the way, in the fastening structure through the rubber bush, the rubber bush is generally press-fitted into a through hole of a supported member such as a suspension arm, and the supported member and the supporting member (for example, the suspension bracket) are connected to the rubber bush. These are connected by pins, bolts or the like inserted into the inner cylinder. In such a fastening structure, when the enlarged diameter portion is formed at the end portion of the inner cylinder as in the above-described prior art, the enlarged diameter portion needs to be exposed from both ends of the through hole of the supported member. That is, the axial length of the rubber bush must be larger than the axial length of the through hole of the supported member. For this reason, depending on the length of the through hole of the supported member in the axial direction, the length of the rubber bush in the axial direction must be increased more than necessary, leading to the problem of increasing the size and mass of the rubber bush. Can occur.
そこで、本発明は、小型化・軽量化に有利なブッシュ構造、締結構造、ブッシュ、及び、これを有するサスペンションアームの提供を目的とする。 Therefore, an object of the present invention is to provide a bush structure, a fastening structure, a bush, and a suspension arm having the same, which are advantageous for downsizing and weight reduction.
上記目的を達成するため、本発明の一局面によれば、筒状部材である内筒と、内筒よりも大きな基本径を持つ外筒と、内筒と外筒の間に配置され両筒を結合する弾性体とを有するブッシュを含み、
前記外筒の基本径よりも小さく、且つ、ブッシュの内筒内に挿通されるピン状の部材の一端に固定されるナットの径よりも小さい径の縮径部が、前記外筒の前記ナット側端部の少なくとも一部に付与されていることを特徴とし、
前記外筒の軸方向で前記縮径部と前記ナットと間に弾性体が存在しない、ブッシュ構造が提供される。
In order to achieve the above object, according to one aspect of the present invention, an inner cylinder that is a cylindrical member, an outer cylinder having a larger basic diameter than the inner cylinder, and both cylinders disposed between the inner cylinder and the outer cylinder And a bush having an elastic body for coupling,
A reduced diameter portion having a diameter smaller than the basic diameter of the outer cylinder and smaller than the diameter of a nut fixed to one end of a pin-like member inserted into the inner cylinder of the bush is the nut of the outer cylinder. It is given to at least a part of the side end ,
A bush structure is provided in which no elastic body exists between the reduced diameter portion and the nut in the axial direction of the outer cylinder .
本局面において、上記小さい径は、例えば、外筒の前記ナット側端部を径方向内側に変形させる（例えば、凹部を形成する）ことによって、若しくは、外筒の前記ナット側端部に別部材を設けることによって、付与されてよい。効果的には、前記ブッシュの内筒は、前記ナット側端部で径が小さくなる小径部を有する。 In this aspect, the small diameter is formed by, for example, deforming the nut-side end portion of the outer cylinder inward in the radial direction (for example, forming a recess), or another member at the nut-side end portion of the outer cylinder. May be provided. Effectively, the inner cylinder of the bush has a small-diameter portion whose diameter becomes smaller at the nut-side end portion.
また、本発明のその他の一局面によれば、筒状部材である内筒と、内筒よりも大きな基本径を持つ外筒と、内筒と外筒の間に配置され両筒を結合するゴム弾性体とを有し、第１の部材に形成された貫通穴に圧入されるゴムブッシュと、
第２の部材から延在し、ゴムブッシュの内筒内に挿通されるピン状の部材と、
ゴムブッシュの内筒から露出するピン状部材の端部に固定されるナットとを含む、第１の部材と第２の部材とを締結する締結構造において、
前記外筒の前記ナット側端部の少なくとも一部に、前記外筒の基本径よりも小さく且つ前記ナットの径よりも小さい径の縮径部が付与されており、前記ナットが、前記第１の部材の貫通穴内に少なくとも部分的に配置されていることを特徴とし、
前記外筒の軸方向で前記縮径部と前記ナットと間に弾性体が存在しない、締結構造が提供される。
According to another aspect of the present invention, an inner cylinder that is a cylindrical member, an outer cylinder having a larger basic diameter than the inner cylinder, and the two cylinders that are disposed between the inner cylinder and the outer cylinder are coupled. A rubber bush having a rubber elastic body and press-fitted into a through hole formed in the first member;
A pin-like member extending from the second member and inserted into the inner cylinder of the rubber bush;
In the fastening structure for fastening the first member and the second member, including a nut fixed to the end of the pin-like member exposed from the inner cylinder of the rubber bush,
A reduced diameter portion having a diameter smaller than the basic diameter of the outer cylinder and smaller than the diameter of the nut is provided on at least a part of the nut-side end portion of the outer cylinder. characterized in that it is at least partially disposed in the member through hole,
A fastening structure is provided in which no elastic body exists between the reduced diameter portion and the nut in the axial direction of the outer cylinder .
また、本発明のその他の一局面によれば、筒状部材である内筒と、内筒よりも大きな基本径を持つ外筒と、内筒と外筒の間に配置され両筒を結合する弾性体とを有するブッシュを含み、
前記外筒の基本径よりも小さく、且つ、ブッシュの内筒内に軸部が挿通されるボルトの頭部の径よりも小さい径の縮径部が、前記外筒における前記ボルトの頭部側端部の少なくとも一部に付与されていることを特徴とし、
前記外筒の軸方向で前記縮径部と前記ボルトの頭部と間に弾性体が存在しない、ブッシュ構造が提供される。
According to another aspect of the present invention, an inner cylinder that is a cylindrical member, an outer cylinder having a larger basic diameter than the inner cylinder, and the two cylinders that are disposed between the inner cylinder and the outer cylinder are coupled. A bush having an elastic body,
A reduced diameter portion having a diameter smaller than the basic diameter of the outer cylinder and smaller than the diameter of the head portion of the bolt through which the shaft portion is inserted into the inner cylinder of the bush is the head side of the bolt in the outer cylinder. It is given to at least a part of the end ,
A bush structure is provided in which no elastic body exists between the reduced diameter portion and the head of the bolt in the axial direction of the outer cylinder .
本発明によれば、ブッシュの弾性体が破断した場合であっても、ゴムブッシュの内筒がピン状の部材等共にゴムブッシュの外筒から抜けるのを防止することが可能となる。また、ゴムブッシュ等の小型化が容易となる。 According to the present invention, even when the elastic body of the bush is broken, it is possible to prevent the inner cylinder of the rubber bush from coming off from the outer cylinder of the rubber bush together with the pin-like member and the like. Further, it is easy to reduce the size of the rubber bush or the like.
以下、図面を参照して、本発明を実施するための最良の形態の説明を行う。 The best mode for carrying out the present invention will be described below with reference to the drawings.
図１は、本発明が適用される車両のサスペンション構造の要部を示す図（正面図）である。このサスペンション構造は、車輪を車体に対して揺動可能に支持するためのサスペンションアーム１０（ロアアーム）を有する。サスペンションアーム１０は、公知の如く、ボールジョイント、ナックルアーム、ベアリング、ハブ等（図示せず）を介して車輪に連結されている。サスペンションアーム１０には、サスペンションブラケット２０がゴムブッシュ３０を介して取り付けられている。サスペンションブラケット２０は、車体に一端が固定されたショックアブソーバ７０の他端にボルト等により結合されている。このサスペンション構造では、路面からの入力等による車輪の上下振動は、主に、サスペンションアーム１０からサスペンションブラケット２０を介してショックアブソーバ７０により吸収される。 FIG. 1 is a diagram (front view) showing a main part of a suspension structure of a vehicle to which the present invention is applied. This suspension structure has a suspension arm 10 (lower arm) for supporting the wheel so as to be swingable with respect to the vehicle body. As is well known, the suspension arm 10 is connected to the wheel via a ball joint, a knuckle arm, a bearing, a hub, etc. (not shown). A suspension bracket 20 is attached to the suspension arm 10 via a rubber bush 30. The suspension bracket 20 is coupled to the other end of the shock absorber 70 whose one end is fixed to the vehicle body by a bolt or the like. In this suspension structure, vertical vibrations of the wheel due to input from the road surface or the like are mainly absorbed by the shock absorber 70 from the suspension arm 10 via the suspension bracket 20.
以下、サスペンションアーム１０とサスペンションブラケット２０との締結構造に適用された本発明の一実施例を説明する。尚、本発明は、特にサスペンションアーム１０やサスペンションブラケット２０の形状を特定するものではなく、如何なる形状・構造を持つサスペンションアーム１０及びサスペンションブラケット２０に対しても適用可能である。 Hereinafter, an embodiment of the present invention applied to a fastening structure of the suspension arm 10 and the suspension bracket 20 will be described. The present invention does not particularly specify the shapes of the suspension arm 10 and the suspension bracket 20, and can be applied to the suspension arm 10 and the suspension bracket 20 having any shape and structure.
図２は、図１のＡ−Ａ断面を示す図である。サスペンションアーム１０には、ゴムブッシュ３０が圧入される貫通穴１２が形成されている。ゴムブッシュ３０は、貫通穴１２の径と略同一の径Ｒ１（基本径Ｒ１）を持つ外筒３１０と、外筒３１０の基本径Ｒ１よりも小さい径を持ち、外筒３１０の内側に配設される内筒３２０とからなる。即ち、ゴムブッシュ３０は、同軸に配置された外筒３１０と内筒３２０との２重筒構造を有する。外筒３１０と内筒３２０との間には、ゴム３２が加硫成形され、これにより、両筒３１０，３２０が結合されている。 FIG. 2 is a view showing a cross section taken along the line AA of FIG. The suspension arm 10 is formed with a through hole 12 into which the rubber bush 30 is press-fitted. The rubber bush 30 has an outer cylinder 310 having a diameter R1 (basic diameter R1) substantially the same as the diameter of the through hole 12 and a diameter smaller than the basic diameter R1 of the outer cylinder 310, and is disposed inside the outer cylinder 310. The inner cylinder 320 is formed. That is, the rubber bush 30 has a double cylinder structure of an outer cylinder 310 and an inner cylinder 320 arranged coaxially. The rubber 32 is vulcanized and molded between the outer cylinder 310 and the inner cylinder 320, whereby both the cylinders 310 and 320 are joined.
ゴムブッシュ３０の内筒３２０内には、サスペンションブラケット２０のピン２２が挿通されている。ピン２２の一端は、サスペンションブラケット２０に形成された穴２１とセレーション結合されている。ピン２２の他端は、ゴムブッシュ３０の内筒３２０から所定長さだけ露出している。この露出したピン２２の他端には、螺子（図示せず）が形成され、ナット４０が螺合される。これにより、サスペンションブラケット２０は、サスペンションアーム１０にゴムブッシュ３０を介して締結される。 The pin 22 of the suspension bracket 20 is inserted into the inner cylinder 320 of the rubber bush 30. One end of the pin 22 is serrated with a hole 21 formed in the suspension bracket 20. The other end of the pin 22 is exposed from the inner cylinder 320 of the rubber bush 30 by a predetermined length. A screw (not shown) is formed at the other end of the exposed pin 22, and the nut 40 is screwed together. As a result, the suspension bracket 20 is fastened to the suspension arm 10 via the rubber bush 30.
ゴムブッシュ３０の内筒３２０の一端面は、ナット４０の座面４２（ゴムブッシュ３０側の面）に当接し（即ち、内筒３２０の一端面がナット４０に着座面を提供する）、内筒３２０の他端面は、サスペンションブラケット２０（のピン２２まわりの表面）に当接している。一方、外筒３１０のナット４０側の端部３１２は、ナット４０の座面４２から離間している。このような構成により、サスペンションブラケット２０とサスペンションアーム１０との相対的な移動が、ゴム３２の弾性変形により吸収されることになる。 One end surface of the inner cylinder 320 of the rubber bush 30 is in contact with the seat surface 42 (the surface on the rubber bush 30 side) of the nut 40 (that is, one end surface of the inner cylinder 320 provides a seating surface for the nut 40). The other end surface of the cylinder 320 is in contact with the suspension bracket 20 (the surface around the pin 22 thereof). On the other hand, the end 312 on the nut 40 side of the outer cylinder 310 is separated from the seating surface 42 of the nut 40. With such a configuration, the relative movement between the suspension bracket 20 and the suspension arm 10 is absorbed by the elastic deformation of the rubber 32.
図３は、図２の矢印Ｘ方向（軸方向）から見た図である。外筒３１０のナット４０側の端部３１２には、図２及び図３に示すように、ナット４０の径（本例では、座面４２の径）よりも小さな径が付与されている。かかる端部３１２を有する外筒３１０は、アルミや鉄等からなる筒状部材（一定の径の筒状部材）を形成した後、その開口端部を径方向内側に塑性変形させる（即ち、筒状部材を径方向外側から内側に凹ませる）ことにより形成される。以下、外筒３１０の端部３１２における径が縮小された部位を、縮径部３１４と称する。尚、縮径部３１４は、上述の如く外筒３１０と一体的に形成されるものであってよく、或いは、別部材が溶接等により外筒３１０に結合されることにより実現されてもよい。 FIG. 3 is a diagram viewed from the direction of the arrow X (axial direction) in FIG. As shown in FIGS. 2 and 3, a diameter smaller than the diameter of the nut 40 (in this example, the diameter of the seating surface 42) is given to the end 312 on the nut 40 side of the outer cylinder 310. The outer cylinder 310 having the end 312 forms a cylindrical member (a cylindrical member having a constant diameter) made of aluminum, iron, or the like, and then plastically deforms the opening end thereof radially inward (that is, the cylinder). The concave member is recessed from the radially outer side to the inner side). Hereinafter, the portion where the diameter of the end 312 of the outer cylinder 310 is reduced is referred to as a reduced diameter portion 314. The reduced diameter portion 314 may be formed integrally with the outer cylinder 310 as described above, or may be realized by connecting another member to the outer cylinder 310 by welding or the like.
図２及び図３に示す実施例では、縮径部３１４は、外筒３１０の端部３１２に２箇所設定されている。この対の縮径部３１４は、好ましくは、外筒３１０の中心軸に関して対角関係（対称）となるように設定される。但し、縮径部３１４は、１箇所若しくは３箇所以上設定される凹部であってよく、周方向に沿った如何なる間隔で設定される凹部であってもよい。 In the embodiment shown in FIGS. 2 and 3, the reduced diameter portion 314 is set at two locations on the end 312 of the outer cylinder 310. The pair of reduced diameter portions 314 is preferably set to have a diagonal relationship (symmetric) with respect to the central axis of the outer cylinder 310. However, the reduced diameter portion 314 may be a recess set at one place or three or more, or may be a recess set at any interval along the circumferential direction.
本実施例の内筒３２０（ナット４０側の端部３２２）には、外筒３１０の縮径部３１４に対応して、内筒３２０の基本径よりも小さい径を持つ小径部３２４が形成されている。内筒３２０の小径部３２４は、外筒３１０の縮径部３１４に対応した軸方向範囲に亘り形成されてよい。これにより、上述の如く外筒３１０に縮径部３１４を設定した場合であっても、外筒３１０と内筒３２０との間に適切な隙間が軸方向全体に亘り確保され、ゴム３２の適切な弾性変形範囲が確保される。尚、図示の実施例では、内筒３２０の基本径から小径部３２４の径への変化点は、ゴム３２の形成部位よりもナット４０側に設定されている。 A small diameter portion 324 having a diameter smaller than the basic diameter of the inner cylinder 320 is formed in the inner cylinder 320 (end portion 322 on the nut 40 side) of the present embodiment corresponding to the reduced diameter portion 314 of the outer cylinder 310. ing. The small diameter part 324 of the inner cylinder 320 may be formed over an axial range corresponding to the reduced diameter part 314 of the outer cylinder 310. Thereby, even when the reduced diameter portion 314 is set in the outer cylinder 310 as described above, an appropriate gap is ensured over the entire axial direction between the outer cylinder 310 and the inner cylinder 320, and the rubber 32 An elastic deformation range is ensured. In the illustrated embodiment, the changing point from the basic diameter of the inner cylinder 320 to the diameter of the small diameter portion 324 is set closer to the nut 40 than the part where the rubber 32 is formed.
ところで、本実施例では、上述から明らかなように、対のサスペンションブラケットがサスペンションアームを両側から挟むような態様で支持する両持ち構造では無く、単一のサスペンションブラケット２０がサスペンションアーム１０を片側で支持する片持ち構造が採用されている。かかる片持ち構造では、ゴム３２が破断等して内筒３２０と外筒３１０との間の拘束力が失われても、サスペンションブラケット２０が内筒３２０等と共にサスペンションアーム１０から離脱しないような対策を講ずる必要がある。 By the way, in this embodiment, as is clear from the above, a single suspension bracket 20 does not support the suspension arm 10 on one side, rather than a dual-support structure in which the pair of suspension brackets support the suspension arm from both sides. Supporting cantilever structure is adopted. In such a cantilever structure, even if the rubber 32 is broken or the like and the restraining force between the inner cylinder 320 and the outer cylinder 310 is lost, the suspension bracket 20 is not separated from the suspension arm 10 together with the inner cylinder 320 and the like. It is necessary to take.
このような対策の従来的な一例として、図４に示すように、ナット４０ａをサスペンションアーム１０の貫通穴１２から露出させると共に、ナット４０ａの径を貫通穴１２よりも大きくすることが考えられる。この場合、ゴム３２が破断等した場合でも、ナット４０ａの軸方向の移動がサスペンションアーム１０の外面により係止されるので（即ち、ナット４０ａが貫通穴１２内を通過することができないので）、サスペンションブラケット２０がサスペンションアーム１０から離脱することはない。しかしながら、この構成では、サスペンションアーム１０の貫通穴１２の軸方向長さ以上の軸方向長さを持つゴムブッシュ３０ａ（特に内筒）を設計する必要があり、また、ナット４０ａの径を貫通穴１２よりも大きくするため、ナット４０ａ及びゴムブッシュ３０ａの体格・質量が増加し、製品コストやバネ下質量が必要以上に増加するという不都合がある。 As a conventional example of such a countermeasure, as shown in FIG. 4, it is conceivable to expose the nut 40 a from the through hole 12 of the suspension arm 10 and make the diameter of the nut 40 a larger than the through hole 12. In this case, even if the rubber 32 is broken or the like, the axial movement of the nut 40a is locked by the outer surface of the suspension arm 10 (that is, the nut 40a cannot pass through the through hole 12). The suspension bracket 20 is not detached from the suspension arm 10. However, in this configuration, it is necessary to design a rubber bush 30a (especially an inner cylinder) having an axial length that is greater than or equal to the axial length of the through hole 12 of the suspension arm 10, and the diameter of the nut 40a is set to the through hole. Since it is larger than 12, the physique and mass of the nut 40a and the rubber bush 30a increase, and there is a disadvantage that the product cost and unsprung mass increase more than necessary.
これに対して、本実施例では、先ず、ゴム３２が破断等して内筒３２０と外筒３１０との間の拘束力が失われても、外筒３１０の縮径部３１４とナット４０の座面４２とが当接するため（即ち、ナット４０の軸方向の移動が外筒３１０の縮径部３１４により係止されるため）（図２の点線で示すナット４０及び図３のＹ部参照）、サスペンションブラケット２０がサスペンションアーム１０から離脱することはない。また、外筒３１０の縮径部３１４は、サスペンションアーム１０の貫通穴１２の径よりも小さいため、ナット４０の径をサスペンションアーム１０の貫通穴１２の径よりも大きくする必要がなくなる。このため、図２に示すように、ナット４０をサスペンションアーム１０の貫通穴１２内に収めることが可能であり、これにより、ゴムブッシュ３０の軸方向長さを必要以上に大きく設定する必要がなくなる。つまり、本実施例によれば、図４に示す従来的な例に対して、ゴムブッシュ３０及びナット４０の小型化・軽量化を図ることが可能となる。 In contrast, in the present embodiment, first, even if the rubber 32 is broken or the like and the restraining force between the inner cylinder 320 and the outer cylinder 310 is lost, the reduced diameter portion 314 and the nut 40 of the outer cylinder 310 are lost. Because the bearing surface 42 abuts (that is, the axial movement of the nut 40 is locked by the reduced diameter portion 314 of the outer cylinder 310) (see the nut 40 indicated by the dotted line in FIG. 2 and the Y portion in FIG. 3). ), The suspension bracket 20 is not detached from the suspension arm 10. Further, since the reduced diameter portion 314 of the outer cylinder 310 is smaller than the diameter of the through hole 12 of the suspension arm 10, it is not necessary to make the diameter of the nut 40 larger than the diameter of the through hole 12 of the suspension arm 10. For this reason, as shown in FIG. 2, the nut 40 can be accommodated in the through hole 12 of the suspension arm 10, thereby eliminating the need to set the axial length of the rubber bush 30 to be larger than necessary. . That is, according to the present embodiment, the rubber bush 30 and the nut 40 can be made smaller and lighter than the conventional example shown in FIG.
また、本実施例では、上述の如く、外筒３１０の縮径部３１４は、図３に示すように、外筒３１０の周方向に沿って局所的（部分的）に形成されている。これにより、ゴムブッシュ３０内部に溜まりうる水は、外筒３１０の端部３１２の、縮径部３１４以外の部位からの抜け出ることができ、水抜き性が確保されている。但し、例えば、搭載位置・角度によっては水抜き性が不要な場合、或いは、水抜き性が他の手段（例えば、水抜き穴）により確保される場合、外筒３１０の端部３１２には、その全周に亘ってナット４０の径よりも小さい径が付与されてよい（この場合、縮径部３１４は、内筒３２０の小径部３２４と同様な構成となる）。 In the present embodiment, as described above, the reduced diameter portion 314 of the outer cylinder 310 is locally (partially) formed along the circumferential direction of the outer cylinder 310 as shown in FIG. As a result, water that can accumulate in the rubber bush 30 can escape from the portion 312 of the outer cylinder 310 other than the diameter-reduced portion 314, and water drainage is ensured. However, for example, when drainage is unnecessary depending on the mounting position and angle, or when drainage is ensured by other means (for example, drainage holes), the end 312 of the outer cylinder 310 is A diameter smaller than the diameter of the nut 40 may be provided over the entire circumference (in this case, the reduced diameter portion 314 has the same configuration as the small diameter portion 324 of the inner cylinder 320).
尚、図２及び図３に示す実施例では、ナット４０は座付きナットとして示されているが、他の種類のナット、例えば座付きでない丸ナットや六角ナットが使用されてもよい。ナット４０が六角ナットである場合、縮径部３１４には、六角ナットの六角形内に内接する円の径より小さい径が付与されてよい。また、ナット４０と内筒３２０の端面との間にワッシャーが設けられる場合、縮径部３１４には、ワッシャーの径より小さい径が付与されてよい。何れの場合であっても、縮径部３１４とナット４０（又はワッシャー）との係り代（係止時の係り代）は、ピン２２と内筒３２０との隙間や縮径部３１４及びナット４０の強度等を考慮して、上述のサスペンションブラケット２０の抜け防止機能が発揮されるように決定される。 In the embodiment shown in FIGS. 2 and 3, the nut 40 is shown as a seated nut, but other types of nuts such as a round nut or a hexagonal nut without a seat may be used. When the nut 40 is a hex nut, the reduced diameter portion 314 may be given a diameter smaller than the diameter of a circle inscribed in the hexagon of the hex nut. Further, when a washer is provided between the nut 40 and the end surface of the inner cylinder 320, a diameter smaller than the diameter of the washer may be given to the reduced diameter portion 314. In any case, the engagement margin between the reduced diameter portion 314 and the nut 40 (or washer) (the engagement margin at the time of locking) is the clearance between the pin 22 and the inner cylinder 320, the reduced diameter portion 314, and the nut 40. In consideration of the strength of the suspension bracket, it is determined so that the above-described function of preventing the suspension bracket 20 from coming off is exhibited.
次に、図５を参照して本発明の第２実施例について説明する。本実施例は、上述の実施例に対して、サスペンションブラケット２０とサスペンションアーム１０とがボルト５０により締結されている点のみが主に異なる。従って、以下説明する構成以外は、上述の実施例の構成と同様であってよい。 Next, a second embodiment of the present invention will be described with reference to FIG. The present embodiment is mainly different from the above-described embodiment only in that the suspension bracket 20 and the suspension arm 10 are fastened by bolts 50. Accordingly, the configuration other than the configuration described below may be the same as the configuration of the above-described embodiment.
本実施例では、ボルト５０の軸部が、上述の実施例のピン２２に代わって、内筒３２０内に挿通されている。内筒３２０は、上述の実施例のような小径部３２４を有してもよいが、内筒３２０の内径は、好ましくは、その軸方向全長に亘って略一定の径を有する。ボルト５０は、図５に示すように、ナット５２又はその類に螺合してもよく、若しくは、サスペンションブラケット２０の穴２１に形成された螺子に螺合してもよい。 In the present embodiment, the shaft portion of the bolt 50 is inserted into the inner cylinder 320 instead of the pin 22 of the above-described embodiment. The inner cylinder 320 may have the small diameter portion 324 as in the above-described embodiment, but the inner diameter of the inner cylinder 320 preferably has a substantially constant diameter over the entire length in the axial direction. As shown in FIG. 5, the bolt 50 may be screwed into the nut 52 or the like, or may be screwed into a screw formed in the hole 21 of the suspension bracket 20.
本実施例においても、外筒３１０のボルト５０側の端部３１２には、図５に示すように、縮径部３１４が設定され、縮径部３１４には、ボルト５０の頭部の径よりも小さな径が付与されている。尚、本実施例において、縮径部３１４の構成は、上述の実施例と同様であってよく、従って、縮径部３１４の径とボルト５０の頭部の径との関係は、上述の実施例における縮径部３１４の径とナット４０の径との関係と同様であってよい。 Also in this embodiment, as shown in FIG. 5, a reduced diameter portion 314 is set at the end 312 on the bolt 50 side of the outer cylinder 310, and the reduced diameter portion 314 has a diameter from the head of the bolt 50. Is also given a small diameter. In this embodiment, the configuration of the reduced diameter portion 314 may be the same as that of the above-described embodiment. Therefore, the relationship between the diameter of the reduced diameter portion 314 and the diameter of the head of the bolt 50 is the same as that described above. The relationship between the diameter of the reduced diameter portion 314 and the diameter of the nut 40 in the example may be the same.
本実施例によれば、上述の実施例と同様、ゴム３２が破断等して内筒３２０と外筒３１０との間の拘束力が失われても、外筒３１０の縮径部３１４とボルト５０の頭部とが当接するため（即ち、ボルト５０の軸方向の移動が外筒３１０の縮径部３１４により係止されるため）、サスペンションブラケット２０がサスペンションアーム１０から離脱することはない。また、ボルト５０の頭部をサスペンションアーム１０の貫通穴１２内に収めることが可能であり、これにより、ゴムブッシュ３０の軸方向長さを必要以上に大きく設定する必要がなくなり、ボルト５０の頭部の小型化も図れる。 According to the present embodiment, similarly to the above-described embodiment, even if the rubber 32 is broken and the binding force between the inner cylinder 320 and the outer cylinder 310 is lost, the reduced diameter portion 314 and the bolt of the outer cylinder 310 are lost. The suspension bracket 20 is not detached from the suspension arm 10 because the head 50 is in contact with the head 50 (that is, the axial movement of the bolt 50 is locked by the reduced diameter portion 314 of the outer cylinder 310). Further, the head of the bolt 50 can be accommodated in the through hole 12 of the suspension arm 10, thereby eliminating the need to set the axial length of the rubber bush 30 to be larger than necessary. The size of the part can also be reduced.
以上、本発明の好ましい実施例について詳説したが、本発明は、上述した各実施例に制限されることはなく、本発明の範囲を逸脱することなく、上述した各実施例に種々の変形及び置換を加えることができる。 The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above-described embodiments, and various modifications and variations can be made to the above-described embodiments without departing from the scope of the present invention. Substitutions can be added.
例えば、上述の各実施例では、サスペンションブラケット２０とサスペンションアーム１０との締結構造に本発明が適用されているが、本発明は、如何なる部材間の締結構造にも適用可能である。例えば、サスペンションアームとサスペンションメンバとの間の締結構造や、サスペンションメンバとステアリングギアボックスとの締結構造等にも同様に適用可能である。 For example, in each of the above-described embodiments, the present invention is applied to the fastening structure between the suspension bracket 20 and the suspension arm 10. However, the present invention can be applied to any fastening structure between members. For example, the present invention can be similarly applied to a fastening structure between the suspension arm and the suspension member, a fastening structure between the suspension member and the steering gear box, and the like.
また、図２及び図５に示す実施例では、ナット４０及びボルト５０の頭部がサスペンションアーム１０の貫通穴１２内に完全に収められているが、サスペンションアーム１０の形状や大きさによっては、図６に示すように、ナット４０がサスペンションアーム１０の貫通穴１２から部分的に露出してもよく、或いは、完全に露出していてもよい。 In the embodiment shown in FIGS. 2 and 5, the heads of the nut 40 and the bolt 50 are completely accommodated in the through hole 12 of the suspension arm 10, but depending on the shape and size of the suspension arm 10, As shown in FIG. 6, the nut 40 may be partially exposed from the through hole 12 of the suspension arm 10 or may be completely exposed.
また、上述の各実施例では、ゴムブッシュ３０の軸方向の長さや加工性を考慮して、ゴムブッシュ３０の外筒３１０の端部３１２に縮径部３１４が形成されているが、例えば、外筒３１０の端部３１２から中央部までの適切な部位に、縮径部３１４（窪み部）が形成されてもよい。 Further, in each of the above-described embodiments, the reduced diameter portion 314 is formed at the end 312 of the outer cylinder 310 of the rubber bush 30 in consideration of the axial length and workability of the rubber bush 30. A reduced diameter portion 314 (recessed portion) may be formed at an appropriate portion from the end 312 to the center of the outer cylinder 310.
１０ サスペンションアーム
１２ 貫通穴
２０ サスペンションブラケット
２２ ピン
３０ ゴムブッシュ
３２ ゴム
３２０ 内筒
３１０ 外筒
３１２ 端部
３１４ 縮径部
４０ ナット
DESCRIPTION OF SYMBOLS 10 Suspension arm 12 Through hole 20 Suspension bracket 22 Pin 30 Rubber bush 32 Rubber 320 Inner cylinder 310 Outer cylinder 312 End 314 Reduced diameter part 40 Nut
Claims (5)
前記外筒の基本径よりも小さく、且つ、ブッシュの内筒内に挿通されるピン状の部材の一端に固定されるナットの径よりも小さい径の縮径部が、前記外筒の前記ナット側端部の少なくとも一部に付与されていることを特徴とし、
前記外筒の軸方向で前記縮径部と前記ナットと間に弾性体が存在しない、ブッシュ構造。 Including a bush having an inner cylinder which is a cylindrical member, an outer cylinder having a larger basic diameter than the inner cylinder, and an elastic body which is disposed between the inner cylinder and the outer cylinder and couples both cylinders,
A reduced diameter portion having a diameter smaller than the basic diameter of the outer cylinder and smaller than the diameter of a nut fixed to one end of a pin-like member inserted into the inner cylinder of the bush is the nut of the outer cylinder. It is given to at least a part of the side end ,
A bush structure in which no elastic body exists between the reduced diameter portion and the nut in the axial direction of the outer cylinder .
第２の部材から延在し、ゴムブッシュの内筒内に挿通されるピン状の部材と、
ゴムブッシュの内筒から露出するピン状部材の端部に固定されるナットとを含む、第１の部材と第２の部材とを締結する締結構造において、
前記外筒の前記ナット側端部の少なくとも一部に、前記外筒の基本径よりも小さく且つ前記ナットの径よりも小さい径の縮径部が付与されており、前記ナットが、前記第１の部材の貫通穴内に少なくとも部分的に配置されていることを特徴とし、
前記外筒の軸方向で前記縮径部と前記ナットと間に弾性体が存在しない、締結構造。 An inner cylinder that is a cylindrical member, an outer cylinder having a larger basic diameter than the inner cylinder, and a rubber elastic body that is disposed between the inner cylinder and the outer cylinder and couples the two cylinders. A rubber bush that is press-fitted into the formed through hole;
A pin-like member extending from the second member and inserted into the inner cylinder of the rubber bush;
In the fastening structure for fastening the first member and the second member, including a nut fixed to the end of the pin-like member exposed from the inner cylinder of the rubber bush,
A reduced diameter portion having a diameter smaller than the basic diameter of the outer cylinder and smaller than the diameter of the nut is provided on at least a part of the nut-side end portion of the outer cylinder. characterized in that it is at least partially disposed in the member through hole,
A fastening structure in which no elastic body exists between the reduced diameter portion and the nut in the axial direction of the outer cylinder .
前記外筒の基本径よりも小さく、且つ、ブッシュの内筒内に軸部が挿通されるボルトの頭部の径よりも小さい径の縮径部が、前記外筒における前記ボルトの頭部側端部の少なくとも一部に付与されていることを特徴とし、
前記外筒の軸方向で前記縮径部と前記ボルトの頭部と間に弾性体が存在しない、ブッシュ構造。 Including a bush having an inner cylinder which is a cylindrical member, an outer cylinder having a larger basic diameter than the inner cylinder, and an elastic body which is disposed between the inner cylinder and the outer cylinder and couples both cylinders,
A reduced diameter portion having a diameter smaller than the basic diameter of the outer cylinder and smaller than the diameter of the head portion of the bolt through which the shaft portion is inserted into the inner cylinder of the bush is the head side of the bolt in the outer cylinder. It is given to at least a part of the end ,
A bush structure in which no elastic body exists between the reduced diameter portion and the head of the bolt in the axial direction of the outer cylinder .
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003337374A JP4211552B2 (en) | 2003-09-29 | 2003-09-29 | Bush structure |
| CNB2004100805276A CN100337050C (en) | 2003-09-29 | 2004-09-28 | Axle sleeve structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003337374A JP4211552B2 (en) | 2003-09-29 | 2003-09-29 | Bush structure |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| JP2005106104A JP2005106104A (en) | 2005-04-21 |
| JP2005106104A5 JP2005106104A5 (en) | 2007-01-11 |
| JP4211552B2 true JP4211552B2 (en) | 2009-01-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2003337374A Expired - Fee Related JP4211552B2 (en) | 2003-09-29 | 2003-09-29 | Bush structure |
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| JP (1) | JP4211552B2 (en) |
| CN (1) | CN100337050C (en) |
Families Citing this family (3)
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| KR100953318B1 (en) | 2008-07-11 | 2010-04-20 | 현대자동차주식회사 | Trailing arm mounting unit for vehicle |
| JP6054707B2 (en) | 2012-11-02 | 2016-12-27 | 山下ゴム株式会社 | Vibration isolator |
| JP7104010B2 (en) | 2019-09-24 | 2022-07-20 | 株式会社ブリヂストン | Suspension bush |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0747974B2 (en) * | 1989-08-23 | 1995-05-24 | 日産自動車株式会社 | Suspension member support structure |
| JP3609145B2 (en) * | 1995-03-28 | 2005-01-12 | 東洋ゴム工業株式会社 | Bush for suspension arm |
| US5988614A (en) * | 1997-09-25 | 1999-11-23 | Atro Engineered Sytems, Inc. | Bushing for heavy vehicles |
| JPH11270606A (en) * | 1998-03-24 | 1999-10-05 | Nissan Motor Co Ltd | Connection structure |
| JP2002081479A (en) * | 2000-09-08 | 2002-03-22 | Toyo Tire & Rubber Co Ltd | Vibration-proof bush |
| JP2002317843A (en) * | 2001-04-19 | 2002-10-31 | Toyo Tire & Rubber Co Ltd | Vibration isolating mount |
-
2003
- 2003-09-29 JP JP2003337374A patent/JP4211552B2/en not_active Expired - Fee Related
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| CN1603653A (en) | 2005-04-06 |
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