JP5292170B2 - Partition member - Google Patents

Partition member Download PDF

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JP5292170B2
JP5292170B2 JP2009110782A JP2009110782A JP5292170B2 JP 5292170 B2 JP5292170 B2 JP 5292170B2 JP 2009110782 A JP2009110782 A JP 2009110782A JP 2009110782 A JP2009110782 A JP 2009110782A JP 5292170 B2 JP5292170 B2 JP 5292170B2
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main body
partition member
fork
passage
side tube
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JP2010261476A (en
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祐毅 浦島
隆博 各務
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KYB Corp
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KYB Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To eliminate a needless labor in manufacturing a partition member to actualize damping operation while locking a suspension spring at one end, e.g. <P>SOLUTION: The partition member is stored in a fork body consisting of a vehicle body side tube T1 and a wheel side tube T2. The partition member includes a body 1 held on the outer periphery of a cylinder C as part of a damper stored in the fork in the state of putting its outer periphery in slide contact with the opposite inner periphery of the fork, and a plurality of passages 1a for permitting the communication of the body 1 at its upper a lower end sides. The passages 1a actualize predetermined damping operation during the passage of operating fluid stored in the fork. The body 1 is formed of a resin material. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

この発明は、区画部材に関し、特に、フロントフォークを構成する車体側チューブと車輪側チューブとからなるフォーク本体内に収装される区画部材の改良に関する。   The present invention relates to a partition member, and more particularly to an improvement of a partition member housed in a fork main body including a vehicle body side tube and a wheel side tube constituting a front fork.

フロントフォークを構成する車体側チューブと車輪側チューブとからなるフォーク本体内に収装される区画部材としては、これまでに種々の提案があるが、その中で、たとえば、特許文献1に開示の提案にあっては、区画部材が環状に形成の本体部を有し、この本体部がフォーク本体内に収装のダンパを構成するシリンダ体の外周に保持されながらその外周をフォーク本体側たる車輪側チューブの内周に摺接させてなる。   There have been various proposals so far for a partition member housed in a fork main body including a vehicle body side tube and a wheel side tube constituting a front fork. Among them, for example, disclosed in Patent Document 1 In the proposal, the partition member has a main body portion formed in an annular shape, and the main body portion is held on the outer periphery of the cylinder body that constitutes the damper of the accommodation in the fork main body, and the outer periphery of the wheel is the fork main body side. It is in sliding contact with the inner periphery of the side tube.

そして、この区画部材は、下端が車輪側チューブの下端側に担持される懸架バネの一端たる上端を下端で係止しながらその上下端側の連通を許容する通路を有し、この通路を作動油が通過するときに所定の減衰作用を具現化する。   The partition member has a passage that allows the upper and lower ends to communicate while the lower end engages the upper end, which is one end of the suspension spring carried on the lower end side of the wheel side tube, and operates the passage. A predetermined damping action is realized when the oil passes.

ちなみに、フォーク本体は、車体側チューブの下端側内に車輪側チューブの上端側を出没可能に挿通させて伸縮可能とされ、懸架バネは、フォーク本体内たるダンパの外、つまり、リザーバに収装されて車体側チューブ内から車輪側チューブが突出する方向に、すなわち、フォーク本体を伸長方向に附勢する。   By the way, the fork main body can be extended and retracted by inserting the upper end side of the wheel side tube into the lower end side of the vehicle body side tube so that it can protrude and retract, and the suspension spring is accommodated outside the damper inside the fork main body, that is, in the reservoir. Then, the fork main body is urged in the extending direction in which the wheel side tube protrudes from the vehicle body side tube.

それゆえ、この特許文献1に開示の区画部材にあっては、フォーク本体の収縮作動時にリザーバにおいて油面が上昇して、作動油がこの区画部材における通路を通過するときに、所定の減衰作用を具現化する。   Therefore, in the partition member disclosed in Patent Document 1, when the fork body contracts, the oil level rises in the reservoir, and when the hydraulic oil passes through the passage in the partition member, a predetermined damping action is obtained. Embody.

特開平6‐109054(要約,明細書中の段落0013,同0025,図2,図3,図4参照)Japanese Patent Laid-Open No. 6-109054 (abstract, see paragraphs 0013 and 0025 in the specification, FIGS. 2, 3 and 4)

しかしながら、上記した特許文献1に開示の区画部材にあっては、リザーバにおける油面が上昇して作動油が通路を通過するときに、所定の減衰作用を具現化する点で、基本的に問題がある訳ではないが、その実施化を勘案すると、些かの不具合があると指摘される可能性がある。   However, the partition member disclosed in Patent Document 1 basically has a problem in that a predetermined damping action is realized when the oil level in the reservoir rises and the hydraulic oil passes through the passage. However, there is a possibility that it may be pointed out that there is a minor defect, considering its implementation.

すなわち、特許文献1に開示の区画部材は、結果として所定の形状を呈すれば良いから、鍛造であれ、鋳造であれ、自由に形成されて良いが、鋳造にあっては、周知のように、いわゆる型抜き作業が必須になる。   That is, since the partition member disclosed in Patent Document 1 may have a predetermined shape as a result, it may be freely formed, whether it is forging or casting. So-called die cutting work is essential.

そして、この型抜き作業の実際を勘案すると、上記した特許文献1に開示の区画部材にあっては、特許文献1中の図4に開示されているように、本体部が多数の小孔からなる通路を有してなるから、この本体部を多数の小孔を有した状態で鋳造するとなると、ほとんど不可能に近いと言い得る。   Then, in consideration of the actual die cutting operation, in the partition member disclosed in Patent Document 1 described above, as disclosed in FIG. Therefore, if the main body is cast with a large number of small holes, it can be said that it is almost impossible.

そこで、この区画部材における本体部は、軽量化を意図してアルミ材で通路を有しない状態に鋳造され、爾後に、たとえば、ドリル利用で多数の小孔を開穿することになるから、この本体部の形成には、多大な手間を要し、その分バネ受け部材における部品コストの低減を困難にし、製品たるフロントフォークにおけるコストの低廉化を阻害し易くなる不具合がある。   Therefore, the main body portion in this partition member is cast in a state having no passage with an aluminum material for the purpose of weight reduction, and after punching, for example, a large number of small holes are opened by using a drill. The formation of the main body portion requires a lot of labor, and accordingly, it is difficult to reduce the cost of parts of the spring receiving member, and there is a problem that it is difficult to reduce the cost of the front fork as a product.

この発明は、上記した事情を鑑みて創案されたものであって、その目的とするところは、懸架バネの一端を係止しながら減衰作用を具現化する要素とされるのはもちろんのこと、その製作にいたずらな手間を要せず、したがって、フロントフォークにおける製品コストの低廉化に寄与し、その汎用性の向上を期待するのに最適となる区画部材を提供することである。   The present invention was created in view of the above-described circumstances, and the object of the invention is, of course, an element that embodies the damping action while locking one end of the suspension spring. It is an object of the present invention to provide a partition member that does not require a troublesome labor for its manufacture, and thus is optimal for contributing to a reduction in the product cost of the front fork and expecting improvement in its versatility.

上記した目的を達成するため、この発明による区画部材の手段は、 車体側チューブと車輪側チューブとからなるフォーク本体内に収装される区画部材であって、上記のフォーク本体内に収装のダンパを構成するシリンダ体の外周に保持されながらその外周を対向する上記のフォーク本体側の内周に軸受を介して摺接する本体部と、この本体部の上下端側の連通を許容する複数の通路とを有し、上記の通路が上記のシリンダ体の軸線方向に沿うと共に平面視で円弧状を呈するように周方向に沿って等間隔に三本以上形成され、上記の通路が上記のフォーク本体内に収容の作動流体の通過時に所定の減衰作用を具現化してなる区画部材において、上記の本体部が樹脂材で形成され、更に、上記の通路が上記のシリンダ体の軸線方向に沿って延びると共に放射方向に延びる複数の縦リブと、この複数の縦リブの外周に嵌装される筒状の軸受とで形成されてなることを特徴とする。
In order to achieve the above-described object, the means of the partition member according to the present invention is a partition member that is housed in a fork main body composed of a vehicle body side tube and a wheel side tube, and is housed in the fork main body. A main body part that is slidably contacted with the inner periphery on the fork main body side facing the outer periphery while being held on the outer periphery of the cylinder body constituting the damper via a bearing, and a plurality of parts that allow communication on the upper and lower ends of the main body part And three or more passages are formed at equal intervals along the circumferential direction so as to form an arc shape in a plan view along the axial direction of the cylinder body. In a partition member that realizes a predetermined damping action when the working fluid contained in the body passes, the main body portion is formed of a resin material, and the passage is further along the axial direction of the cylinder body. Extend A plurality of longitudinal ribs extending radially together, characterized in that formed by formed by a cylindrical bearing which is fitted on the outer periphery of the plurality of longitudinal ribs.

それゆえ、この発明にあっては、区画部材を構成する環状に形成の本体部が樹脂材からなるから、通路の形状を複雑にしない限りにおいて、本体部の型成形による整形、すなわち、本体部を形成する際にこの本体部に所定の通路を併せて形成するのを容易にし、いたずらな手間を要しない。   Therefore, in the present invention, since the annularly formed main body portion constituting the partition member is made of a resin material, as long as the shape of the passage is not complicated, shaping of the main body portion by molding, that is, the main body portion It is easy to form a predetermined passage in the main body portion at the time of forming, and no troublesome work is required.

そして、区画部材を構成する本体部が所定の通路を有するから、フォーク本体の伸縮に伴って作動流体が本体部に形成の通路を通過するときに、所定の減衰作用を具現化する。   And since the main-body part which comprises a partition member has a predetermined channel | path, when a working fluid passes the channel | path formed in a main-body part with the expansion-contraction of a fork main body, a predetermined | prescribed damping effect is embodied.

この発明の一実施形態による区画部材を有するフロントフォークを原理的に示す縦断面図である。It is a longitudinal cross-sectional view which shows in principle the front fork which has the division member by one Embodiment of this invention. 図1中のX‐X線位置で示す区画部材の横断面図である。It is a cross-sectional view of the partition member shown by the XX line position in FIG. 他の実施形態による区画部材を図1と同様に示す部分図である。It is the fragmentary figure which shows the division member by other embodiment similarly to FIG. さらに他の実施形態による区画部材を図3と同様に示す図である。It is a figure which shows the division member by other embodiment similarly to FIG. 図4中のX‐X線位置で示す区画部材の上端面図である。FIG. 5 is a top view of the partition member indicated by the position of line XX in FIG. 4.

以下に、図示した実施形態に基づいて、この発明を説明するが、図1に示すように、この発明による区画部材は、フロントフォークを構成する車体側チューブT1と車輪側チューブT2とからなるフォーク本体内に収装されるもので、図示するところでは、このフォーク本体を伸長方向に附勢する懸架バネSの図中で上端となる一端を係止するバネ受けとしても機能する。   Hereinafter, the present invention will be described based on the illustrated embodiment. As shown in FIG. 1, a partition member according to the present invention is a fork comprising a vehicle body side tube T1 and a wheel side tube T2 constituting a front fork. It is housed in the main body and, as shown in the figure, also functions as a spring receiver that locks one end that is the upper end in the drawing of the suspension spring S that urges the fork body in the extending direction.

すなわち、この区画部材は、図2にも示すように、環状に形成された二つの円筒からなる本体部1と、二つの円筒間に設けた縦リブとを有すると共に、この本体部1にこの本体部1の上下方向となる軸線方向に開穿されてこの本体部1の上下端側の連通を許容する複数の通路1aを有しているThat is, as shown in FIG. 2, the partition member has a main body portion 1 composed of two circular cylinders formed in an annular shape and a vertical rib provided between the two cylinders. and a plurality of passages 1a to allow communication between the upper and lower side of the main body portion 1 is perforated in the axial direction which is a vertical direction of the body 1.

そして、この区画部材にあって、本体部1は、図1に示すように、フォーク本体内に収装のダンパを構成するシリンダ体Cの外周に保持されながら、その外周を、すなわち、その外周に介装の軸受2の外周を対向するフォーク本体側、すなわち、図示するところでは、車輪側チューブT2の内周に摺接させる。   And in this partition member, as shown in FIG. 1, the main body 1 is held on the outer periphery of the cylinder body C that constitutes the damper of the accommodation in the fork main body, while its outer periphery, that is, its outer periphery. The outer periphery of the intervening bearing 2 is brought into sliding contact with the opposing fork main body side, that is, in the drawing, the inner periphery of the wheel side tube T2.

その結果、この本体部1を有する区画部材は、この区画部材を挟んで言わばフォーク本体内であってダンパの外となるリザーバを上下に画成すると共に、通路1aを介して本体部1の上下端側の連通を許容し、フォーク本体内に収容の作動流体が、すなわち、フォーク本体の伸縮作動時に液面(図示せず)を昇降させる作動流体が上記の通路1aを通過するときに所定の減衰作用を具現化する。   As a result, the partition member having the main body portion 1 vertically defines a reservoir inside the fork main body and outside the damper, with the partition member interposed therebetween, and the upper and lower portions of the main body portion 1 through the passage 1a. The working fluid accommodated in the fork main body that allows end-side communication, that is, when the working fluid that raises and lowers the liquid level (not shown) when the fork main body is extended or contracted passes through the passage 1a. Embody the damping effect.

このとき、図示するところでは、フォーク本体が車体側チューブT1を大径のアウターチューブにすると共に車輪側チューブT2を小径のインナーチューブにする倒立型に設定され、また、ダンパがシリンダ体Cを上端側部材にすると共にロッド体Rを下端側部材にする倒立型に設定されてなるが、それぞれが逆の正立型に設定されても良い。   At this time, as shown in the figure, the fork main body is set to be an inverted type in which the vehicle body side tube T1 is a large diameter outer tube and the wheel side tube T2 is a small diameter inner tube, and the damper has the cylinder body C at the upper end. Although it is set to the inverted type which makes it the side member and makes the rod body R a lower end side member, each may be set to an inverted upright type.

すなわち、図示しないが、フォーク本体が車体側チューブT1を小径のインナーチューブにすると共に車輪側チューブT2を大径のアウターチューブにし、また、ダンパがシリンダ体Cを下端側部材にすると共にロッド体Rを上端側部材にしても良い。   That is, although not shown, the fork body makes the vehicle body side tube T1 a small diameter inner tube and the wheel side tube T2 makes a large diameter outer tube, and the damper makes the cylinder body C the lower end side member and the rod body R. May be an upper end member.

ちなみに、図示するように、フォーク本体およびダンパが共に倒立型に設定されるときには、懸架バネSの他端たる下端は、車輪側チューブT2のボトム側に担持される。   Incidentally, as shown in the figure, when both the fork main body and the damper are set upside down, the lower end as the other end of the suspension spring S is carried on the bottom side of the wheel side tube T2.

それに対して、図示しないが、フォーク本体およびダンパが共に正立型に設定されるときには、懸架バネSの一端たる下端がバネ受として機能する区画部材の上端に係止、すなわち、担持され、他端たる上端は、車体側チューブT1の上端側に係止される。   On the other hand, although not shown, when both the fork main body and the damper are set upright, the lower end as one end of the suspension spring S is locked, that is, supported by the upper end of the partition member functioning as a spring receiver. The upper end that is the end is locked to the upper end side of the vehicle body side tube T1.

なお、フォーク本体内には、所定量の作動流体たる作動油が収容され、その際の液面たる油面の位置は、区画部材の下端下方とされて良いが、シリンダ体C内に気泡を混入する作動油を流入させない観点からは、シリンダ体Cにおけるロッド体Rを出没させる端部、すなわち、ヘッド端部(符示せず)を油中に位置決めるように設定されるのが好ましい。   The fork main body contains a predetermined amount of hydraulic fluid as a working fluid, and the oil level at that time may be located below the lower end of the partition member. From the viewpoint of preventing the mixed hydraulic oil from flowing in, it is preferable to set the end of the cylinder body C that causes the rod body R to protrude and retract, that is, the head end (not shown) is positioned in the oil.

また、ダンパにあっては、シリンダ体Cに対してロッド体Rが出没可能に挿通されて伸縮可能とされ、懸架バネSによって伸長方向に附勢されながら、図示しないが、シリンダ体Cに対してロッド体Rが出没するときにシリンダ体C内に収装の減衰部で所定の減衰作用を具現化する。   In addition, in the damper, the rod body R is inserted into the cylinder body C so as to be able to extend and retract, and can be expanded and contracted. Thus, when the rod body R appears and disappears, a predetermined damping action is realized in the cylinder body C by the damping part of the accommodation.

一方、この発明による区画部材は、前記したように、環状に形成の本体部1を有すると共に、この本体部1にこの本体部1の上下端側の連通を許容する複数の通路1aを有してなる。   On the other hand, as described above, the partition member according to the present invention has the body portion 1 formed in an annular shape, and has a plurality of passages 1a that allow the body portion 1 to communicate with the upper and lower ends of the body portion 1. It becomes.

ちなみに、この区画部材にあって、本体部1は、図示する環状に形成されるのに代えて、図示しないが、筒状に形成されても良く、このとき、通路の形成を容易にするように、たとえば、上端側を収斂させて懸架バネSの上端を係止する下端よりも上端を小径にする截頭円錐筒状に形成され、上端側と下端側の間となる言わば傾斜部の肉厚を長く貫通するようにして通路が形成されるのが良い。   Incidentally, in this partition member, the main body 1 may be formed in a cylindrical shape (not shown) instead of being formed in the annular shape shown in the drawing, and at this time, it is easy to form a passage. For example, it is formed in the shape of a truncated conical cylinder having a smaller diameter at the upper end than the lower end at which the upper end side is converged and the upper end of the suspension spring S is locked. The passage may be formed so as to penetrate the thickness for a long time.

ところで、この区画部材にあって、本体部1は、ダンパにおけるシリンダ体Cの外周に固定状態に保持されるが、図示するところでは、シリンダ体Cの外周に上下に形成の環状溝C1,C2に上下のストップリング3,4を嵌装してこの上下のストップリング3,4で挟持されるとしている。   By the way, in this partition member, the main body 1 is held in a fixed state on the outer periphery of the cylinder body C in the damper. However, in the drawing, the annular grooves C1 and C2 formed vertically on the outer periphery of the cylinder body C. The upper and lower stop rings 3, 4 are fitted to the upper and lower stop rings 3, 4.

このとき、下段のストップリング4に関しては、本体部1が懸架バネSの附勢力で上方に押し上げられる状態に維持されるから、上段のストップリング3が在る限りには、その配設が省略されても良い。   At this time, the lower stop ring 4 is maintained in a state where the main body 1 is pushed upward by the urging force of the suspension spring S. Therefore, as long as the upper stop ring 3 is present, the arrangement thereof is omitted. May be.

特に、上下となるストップリング3,4がシリンダ体Cの外周に形成の環状溝C1,C2に嵌装されることを鑑みると、シリンダ体Cにおける機械的強度を保障する上からは、シリンダ体Cの外周に形成される環状溝は、少ない方が良い。   In particular, in view of the fact that the upper and lower stop rings 3 and 4 are fitted into the annular grooves C1 and C2 formed on the outer periphery of the cylinder body C, in order to ensure the mechanical strength of the cylinder body C, the cylinder body The number of annular grooves formed on the outer periphery of C is better.

なお、本体部1における上記のストップリング3が隣接される内周側の上端は、図示するところでは、本体部1における外周側の上端と面一になるように設定されているが、これに代えて、外周側の上端より内周側の上端の方が高くなるように設定されても良く、この場合には、後述する図3に示す実施形態を具現化する上で有利となる。   The upper end on the inner peripheral side of the main body 1 adjacent to the stop ring 3 is set so as to be flush with the upper end on the outer peripheral side of the main body 1. Instead, the upper end on the inner peripheral side may be set higher than the upper end on the outer peripheral side, which is advantageous in realizing an embodiment shown in FIG. 3 to be described later.

つぎに、上記の本体部1に形成される通路1aについてだが、作動油が通過するときに所定の減衰作用を具現化することからして、設定の減衰作用を具現化できる形状とされるのはもちろんであるが、フォーク本体内における円滑な作動油の流れを保障する上からは、たとえば、必要以上の絞り効果を発揮しない形状が選択されるであろう。   Next, with respect to the passage 1a formed in the main body 1 described above, since the predetermined damping action is realized when the hydraulic oil passes, the shape of the setting damping action can be realized. Of course, in order to ensure a smooth flow of hydraulic oil in the fork main body, for example, a shape that does not exhibit an excessive throttling effect will be selected.

そして、この通路1aは、図示するところでは、平面視で全長を円のほぼ1/4にする円弧状に形成され、長さを、すなわち、本体部1における軸線方向に沿う長さを本体部1の上端から下端に至る全長に一致させている。   The passage 1a is formed in an arc shape having an overall length substantially ¼ of a circle in plan view, and the length, that is, the length along the axial direction of the main body 1 is the main body. It is made to correspond with the full length from the upper end of 1 to a lower end.

そしてまた、通路1aは、図2に示すように、本体部1の周方向に等間隔となる四箇所に設けられる四本とするが、これに代えて、図示しないが、等間隔の三箇所に設けられる三本とされても良く、また、同じく図示しないが、等間隔の五本以上とされても良い。   In addition, as shown in FIG. 2, the passage 1a is provided at four locations that are equally spaced in the circumferential direction of the main body 1. Instead of this, three locations that are equally spaced are not shown. Although not shown in the figure, the number may be five or more at equal intervals.

ただ、前記した特許文献1に開示の提案のように、通路が、等間隔ではあるが、十六本と言う多数本の小孔からなる場合には、その形成が容易でないのは前述した通りであって、この観点からすると、この発明にあって、通路1aが、たとえば、等間隔の九本以上とされる場合には、この発明が意図するところ、つまり、バネ受とされる場合の強度を保障しつつ、適度の減衰作用の具現化を可能にする構成に沿わなくなる可能性があり、好ましい選択と言い得ない危惧がある。   However, as described above, when the passage is composed of a large number of small holes of sixteen as described in the proposal disclosed in Patent Document 1, the formation is not easy as described above. From this point of view, in the present invention, when the number of the passages 1a is, for example, equal to or more than nine, the present invention intends, that is, a case where the spring is used. There is a possibility that it may not conform to the configuration that enables the realization of a moderate damping action while ensuring the strength, and there is a fear that it cannot be said to be a preferable choice.

また、少ない方が良いと言っても、半円状の二本とされたり、C字状に形成されたりするとなると、本体部1における機械的強度が低下されるなど耐久性の保障の点から問題を含むであろう。   Moreover, even if it is said that the smaller one is better, if it is formed in two semicircular shapes or formed in a C shape, the mechanical strength in the main body portion 1 is reduced, from the viewpoint of ensuring durability. Will include problems.

そして、この発明にあって、区画部材における本体部1は、硬質の樹脂材、たとえば、熱可塑性樹脂材で形成されるから、この樹脂材で本体部1が形成されることを鑑みると、また、その際に、通路1aも同時に整形されることを鑑みると、図示する四本、あるいは、図示しない三本以上とされるのが良く、さらには、同じく図示しないが、多くても八本止まりとされるのが良いと言い得るであろう。   And in this invention, since the main-body part 1 in a division member is formed with a hard resin material, for example, a thermoplastic resin material, when considering that the main-body part 1 is formed with this resin material, In this case, considering that the passage 1a is also shaped at the same time, it is preferable that the number of the passages 1a is four or three or more (not shown). It can be said that it is good to be said.

そしてまた、区画部材における本体部1が樹脂材で形成されることで、この本体部1がアルミ材で形成される場合に比較して、型成形で通路1aを含めた全体の整形をなし得る上で有利となり、また、区画部材におけるいわゆる部品コストの低廉化を可能にする上で有利となる。   In addition, since the main body 1 of the partition member is formed of a resin material, the entire shape including the passage 1a can be formed by molding as compared with the case where the main body 1 is formed of an aluminum material. Further, it is advantageous in that the so-called component cost of the partition member can be reduced.

なお、本体部1に複数の通路1aを開穿するとき、図示しないが、複数本となる各通路1aの上下端あるいは上端もしくは下端を環状溝で接続するようにしても良く、この場合には、通路1aの実質長さが短くなるが、型成形の際の型抜き性を良くする上で有利となる。   In addition, when opening a plurality of passages 1a in the main body 1, although not shown, the upper and lower ends, the upper end or the lower end of each passage 1a may be connected by an annular groove. Although the substantial length of the passage 1a is shortened, it is advantageous in improving the die-cutting property at the time of molding.

また、上記の本体部1を形成する素材としての熱可塑性樹脂材としては、たとえば、ポリアセタール(POM),ナイロン,ポリエチレンテレフタレート(PBT)などがあるが、摺動性からは、ポリアセタールが良く、また、耐久性からは、ナイロンが良く、耐油性からは、ポリエチレンテレフタレートが良いが、これらは例示であって、絶対的なものでないことはもちろんである。   In addition, examples of the thermoplastic resin material as a material for forming the main body 1 include polyacetal (POM), nylon, and polyethylene terephthalate (PBT). From the viewpoint of slidability, polyacetal is preferable. From the viewpoint of durability, nylon is preferable, and from the viewpoint of oil resistance, polyethylene terephthalate is preferable. However, these are examples and are not absolute.

区画部材にあって、本体部1が上記のように形成されるとき、この本体部1の外周には、前記したように、軸受2が嵌装され、この軸受2の外周が対向するフォーク本体側たる車輪側チューブ2の内周に摺接する。   In the partition member, when the main body 1 is formed as described above, the outer periphery of the main body 1 is fitted with the bearing 2 as described above, and the outer periphery of the bearing 2 is opposed to the fork main body. It is in sliding contact with the inner periphery of the wheel-side tube 2 as a side.

このとき、軸受2が本体部1の外周における所定の配設位置から簡単に逸脱しないように配慮されるのはもちろんで、図示するところでは、本体部1の上端外周部にフランジ状に形成される係止部1bがストッパとされて本体部1の上方に向けての抜が阻止されている。   At this time, the bearing 2 is not only easily deviated from a predetermined arrangement position on the outer periphery of the main body 1, but, as shown in the drawing, is formed in a flange shape on the outer periphery of the upper end of the main body 1. The locking portion 1b to be used as a stopper is prevented from being pulled out upward of the main body portion 1.

その結果、本体部1が軸受2を有することで、本体部1の車輪側チューブ2に対する摺動性が適正に保障されるが、凡そ区画部材における部品コストの削減を意図する上からすると、この軸受2の配設が省略されて、それゆえ、上記の係止部1bの形成も省略されて、本体部1の外周を車輪側チューブ2の内周に直接摺接させても良い。   As a result, since the main body 1 has the bearing 2, the slidability of the main body 1 with respect to the wheel-side tube 2 is appropriately ensured. The arrangement of the bearing 2 is omitted, and therefore, the formation of the locking portion 1b is also omitted, and the outer periphery of the main body portion 1 may be in direct sliding contact with the inner periphery of the wheel side tube 2.

一方、前記したように、上記した本体部1の下端は、懸架バネSの上端を係止するとしており、そこで、図示するところでは、本体部1の下端には、バネシート5が展設され、これによって、懸架バネSの上端を本体部1の下端に直接接触させることで、たとえば、本体部1の下端が変形し、あるいは、磨耗して、ここを通過して通路1aに向かう作動油の流れを変調させる不具合の招来をあらかじめ回避できる。   On the other hand, as described above, the lower end of the main body 1 is configured to lock the upper end of the suspension spring S, and in the illustrated case, the spring seat 5 is extended at the lower end of the main body 1. Accordingly, by bringing the upper end of the suspension spring S into direct contact with the lower end of the main body 1, for example, the lower end of the main body 1 is deformed or worn, and passes through the hydraulic oil toward the passage 1 a. It is possible to avoid in advance the occurrence of defects that modulate the flow.

ちなみに、図示するところでは、バネシート5の外周側部が図中での立ち上がり部(符示せず)とされて、上端が上記の軸受2の下端に近隣し、したがって、このバネシート5が本体部1の下端部に嵌装されることで、軸受2の本体部1の下方に向けてのいわゆる抜け落ちが阻止されるとしている。   By the way, in the drawing, the outer peripheral side portion of the spring seat 5 is a rising portion (not shown) in the drawing, and the upper end is adjacent to the lower end of the bearing 2. Therefore, the spring seat 5 is the main body portion 1. It is supposed that the so-called drop-out of the bearing 2 toward the lower side of the main body portion 1 is prevented by being fitted to the lower end portion.

なお、バネシート5自体は、下方の懸架バネSの上端が当接されると共に懸架バネSの附勢力で本体部1の下端に押し付けられる状態になるから、これが所定の配設位置から逸脱することはない。   The spring seat 5 itself is brought into a state where the upper end of the lower suspension spring S is brought into contact and pressed against the lower end of the main body 1 by the urging force of the suspension spring S. There is no.

それゆえ、以上のように形成された区画部材にあっては、区画部材を構成する本体部1が樹脂材からなるから、通路1aの形状を複雑にしない限りにおいて、本体部1の型成形による整形、すなわち、本体部1を形成する際にこの本体部1に所定の通路1aを併せて形成するのを容易にし、いたずらな手間を要せず、軽量化も可能になる。   Therefore, in the partition member formed as described above, the main body 1 constituting the partition member is made of a resin material. Therefore, as long as the shape of the passage 1a is not complicated, the main body 1 is molded. When shaping, that is, when forming the main body 1, it is easy to form a predetermined passage 1 a in the main body 1, and it is possible to reduce the weight without requiring a troublesome work.

そして、区画部材を構成する本体部1が懸架バネSの一端を係止する一方で、所定の通路1aを有するから、懸架バネSの伸縮に伴って作動油の油面が昇降することで、作動油がこの通路1aを通過するときに、所定の減衰作用を具現化する。   And while the main-body part 1 which comprises a division member latches one end of the suspension spring S, since it has the predetermined channel | path 1a, the oil level of hydraulic fluid raises / lowers with expansion / contraction of the suspension spring S, When the hydraulic oil passes through the passage 1a, a predetermined damping action is realized.

したがって、区画部材にあって、作動油が本体部1の通路1aを通過することで減衰作用を具現化するとき、この本体部1の下方のリザーバ部分が昇圧傾向になり、その結果、フォーク本体の伸縮作動時にフォーク本体内たるリザーバの作動油中に混入する気泡の膨張などで減衰作用の発現を遅らせるいわゆる「減衰作用のサボリ」を伴わずして、安定した減衰作用の発現を可能にし得ることになる。   Therefore, in the partition member, when the hydraulic oil realizes the damping action by passing through the passage 1a of the main body portion 1, the reservoir portion below the main body portion 1 tends to increase in pressure, and as a result, the fork main body It is possible to realize stable damping action without so-called “sagging of the damping action” that delays the expression of the damping action due to the expansion of bubbles mixed in the hydraulic fluid of the reservoir in the fork body during the expansion / contraction operation of the fork. It will be.

図3は、この発明の他の実施形態による区画部材を前記した図1に示す態勢と同じ態勢で示すが、この実施形態による区画部材にあっては、本体部1に開穿される通路1aの図中で上方となる下流に環状リーフバルブ61で構成される絞り手段6が配設されてなる。   FIG. 3 shows a partition member according to another embodiment of the present invention in the same position as that shown in FIG. 1 described above. In the partition member according to this embodiment, a passage 1a opened in the main body 1 is shown. In the drawing, the throttle means 6 constituted by the annular leaf valve 61 is arranged on the downstream side which is the upper side.

そして、この絞り手段6は、通路1aを介して本体部1の上方に真直ぐ抜けようとする作動油の流れを阻害するように配設されるもので、これによって通路1aを通過する作動油の勢いを低下させる、すなわち、減衰作用を鈍化させ、通路1aを通過する作動油の流れが速い場合に危惧される作動油中への気泡の混入を回避させることが可能になる。   The throttling means 6 is disposed so as to inhibit the flow of the hydraulic oil that is about to go straight above the main body 1 through the passage 1a, and thereby the hydraulic oil passing through the passage 1a. The momentum is reduced, that is, the damping action is slowed down, and it is possible to avoid the mixing of bubbles into the hydraulic oil, which is a concern when the flow of the hydraulic oil passing through the passage 1a is fast.

このことからすると、上記の絞り手段6の構成については、任意であり、図示する環状リーフバルブ61の配設に代えて、図示しないが、たとえば、本体部1の上端に露呈する通路1aの開口に絞り構造を配設するとしても良い。   From this, the configuration of the throttle means 6 is arbitrary, and, for example, the opening of the passage 1a exposed to the upper end of the main body 1 is not shown in place of the annular leaf valve 61 shown in the figure. A diaphragm structure may be provided on the front panel.

ちなみに、この図3に示すところにおいて、本体部1の内周側の上端は、外周側の上端より高くなるように形成され、この高くなった部位をバルブシート部に設定して、上記の環状リーフバルブ61の内周側端に押え部材62を載置して固定状態に定着させている。   Incidentally, in the place shown in FIG. 3, the upper end on the inner peripheral side of the main body 1 is formed so as to be higher than the upper end on the outer peripheral side. A pressing member 62 is placed on the inner peripheral end of the leaf valve 61 and fixed in a fixed state.

なお、この図3に示すところにおいて、その構成が前記した図1に示すところと同様となるところについては、図3中に同一の符号を付するのみとして、その説明を省略する。   In FIG. 3, where the configuration is the same as that shown in FIG. 1 described above, only the same reference numerals are given in FIG. 3, and description thereof is omitted.

図4および図5は、この発明のさらに他の実施形態による区画部材を前記した図1および図2と同様に示すもので、この実施形態の区画部材にあっては、本体部1の通路1aがダンパにおけるシリンダ体Cの軸線方向に沿って延びると共に放射方向に延びる複数の縦リブ1cと、この複数の縦リブ1cの外周に嵌装される筒状の軸受2とで形成されてなる。   FIGS. 4 and 5 show a partition member according to still another embodiment of the present invention in the same manner as FIGS. 1 and 2 described above. In the partition member of this embodiment, the passage 1a of the main body 1 is shown. Is formed by a plurality of vertical ribs 1c extending along the axial direction of the cylinder body C in the damper and extending in the radial direction, and a cylindrical bearing 2 fitted on the outer periphery of the plurality of vertical ribs 1c.

すなわち、この実施形態にあっては、縦リブ1cの間に出現する通路1aは、最終的には軸受2で画成されるとするもので、通路1a自体を独立して形成する場合、すなわち、前記した図1および図3に示すように、本体部1に直に通路1aを開穿する場合に比較して、通路1aの形成を容易にする、つまり、この本体部1を型成形する際の型抜き性を良くする利点がある。   That is, in this embodiment, the passage 1a that appears between the longitudinal ribs 1c is finally defined by the bearing 2, and when the passage 1a itself is formed independently, As shown in FIGS. 1 and 3, the passage 1a can be formed more easily than the case where the passage 1a is directly opened in the main body 1, that is, the main body 1 is molded. There is an advantage of improving the mold release property.

なお、この実施形態にあっても、図4に示すように、本体部1の内周側の上端を外周側の上端より高くするが、これに代えて、図示しないが、これを高くするか低くするか、つまり、外周側と同一レベルにするかは、自由である。   Even in this embodiment, as shown in FIG. 4, the upper end on the inner peripheral side of the main body 1 is made higher than the upper end on the outer peripheral side. It is free to make it lower, that is, to have the same level as the outer peripheral side.

前記したところは、この発明の区画部材が本体部1の下端に懸架バネSの上端を係止させて、バネ受としても機能するとして説明したが、この発明が意図するところからすると、凡そ作動流体の通過時に所定の減衰作用を具現化する通路1aを有する限りには、名称で拘る必要はなく、通路1aを設けるためにのみ配在される、たとえば、スペーサ部材と称されても良いことはもちろんであり、懸架バネSの上端を係止しないことを除いて、その作用効果が異なることはない。   In the above description, it has been described that the partition member of the present invention also functions as a spring receiver by locking the upper end of the suspension spring S to the lower end of the main body portion 1. As long as it has the passage 1a that realizes a predetermined damping action when the fluid passes, there is no need to be concerned with the name, and it may be referred to as a spacer member that is provided only for providing the passage 1a. Of course, except for not locking the upper end of the suspension spring S, the effect is not different.

フロントフォークを構成する車体側チューブと車輪側チューブとからなるフォーク本体内に収装されて、減衰作用を具現化する他、たとえば、懸架バネの一端を係止するバネ受としても機能する区画部材への具現化に向く。   A partition member that is housed in a fork main body that includes a vehicle body side tube and a wheel side tube constituting a front fork to realize a damping action, and also functions as a spring receiver that locks one end of a suspension spring, for example. Suitable for realization.

1 本体部
2 軸受
5 バネシート
C シリンダ体
R ロッド体
S 懸架バネ
T1 車体側チューブ
T2 車輪側チューブ
DESCRIPTION OF SYMBOLS 1 Main-body part 2 Bearing 5 Spring seat C Cylinder body R Rod body S Suspension spring T1 Car body side tube T2 Wheel side tube

Claims (3)

車体側チューブと車輪側チューブとからなるフォーク本体内に収装される区画部材であって、上記のフォーク本体内に収装のダンパを構成するシリンダ体の外周に保持されながらその外周を対向する上記のフォーク本体側の内周に軸受を介して摺接する本体部と、この本体部の上下端側の連通を許容する複数の通路とを有し、上記の通路が上記のシリンダ体の軸線方向に沿うと共に平面視で円弧状を呈するように周方向に沿って等間隔に三本以上形成され、上記の通路が上記のフォーク本体内に収容の作動流体の通過時に所定の減衰作用を具現化してなる区画部材において、上記の本体部が樹脂材で形成され、更に、上記の通路が上記のシリンダ体の軸線方向に沿って延びると共に放射方向に延びる複数の縦リブと、この複数の縦リブの外周に嵌装される筒状の軸受とで形成されてなることを特徴とする区画部材。 A partition member housed in a fork main body composed of a vehicle body side tube and a wheel side tube, and facing the outer periphery of the fork main body while being held on the outer periphery of a cylinder body constituting the damper of the housing. The main body has a main body that is in sliding contact with the inner periphery of the fork main body via a bearing, and a plurality of passages that allow communication on the upper and lower ends of the main body, and the passage is in the axial direction of the cylinder body. Are formed at equal intervals along the circumferential direction so as to form an arc shape in plan view, and the above-described passage embodies a predetermined damping action when the working fluid contained in the fork body passes. In the partition member, the main body is formed of a resin material, and the passages extend along the axial direction of the cylinder body and extend in the radial direction, and the plurality of vertical ribs Outer circumference Partition member characterized by comprising formed by a cylindrical bearing being fitted. 上記の通路の中間部あるいは下流側に絞り手段が配設されてなる請求項1に記載の区画部材。 The partition member according to claim 1, wherein a throttle means is disposed at an intermediate portion or downstream side of the passage . 上記の本体部が下端に上記のフォーク本体内に収装されてこのフォーク本体を伸長方向に附勢する懸架バネの一端を当接させるバネシートを有してバネ受部材とされてなる請求項1または請求項2に記載の区画部材。 2. The spring receiving member having a spring seat that is fitted into the fork main body at the lower end and abuts against one end of a suspension spring that urges the fork main body in the extending direction. Or the division member of Claim 2.
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