JP2016161038A

JP2016161038A - Suspension device

Info

Publication number: JP2016161038A
Application number: JP2015040057A
Authority: JP
Inventors: 坂本　健; Takeshi Sakamoto; 健坂本
Original assignee: Showa Corp
Current assignee: Showa Corp
Priority date: 2015-03-02
Filing date: 2015-03-02
Publication date: 2016-09-05

Abstract

PROBLEM TO BE SOLVED: To provide a suspension device capable of restricting the number of component elements of each of the cushion units, reducing its cost and attaining a large spring reaction force.SOLUTION: This invention relates to a suspension device 1 including a pair of first cushion unit 1A and second cushion unit 1B to suspend a vehicle. The first cushion unit has springs [inner spring 9 and outer spring 10] for dampening vibration by its reaction, and the second cushion unit has an attenuation force generating mechanism having gas and liquid with which the inside thereof is filled, and configured to generate attenuation force through flowing of liquid. In the suspension device, the reaction force of the springs in the first cushion unit is supplemented by a reaction force generated through compression of gas in the second cushion unit, to suspend the vehicle.SELECTED DRAWING: Figure 1

Description

本発明は、一対の第１クッションユニットと第２クッションユニットとを備えた懸架装置に関する。 The present invention relates to a suspension device including a pair of first cushion units and second cushion units.

従来、懸架装置としての例えば自動二輪車用のリアクッションは、懸架スプリングと減衰発生機構とを有したクッションユニット（例えば、特許文献１等参照）を一対備えて構成される。しかしながら、この懸架スプリングと減衰発生機構とを有したクッションユニットを一対備えた構成のリアクッションは、各クッションユニットにそれぞれ懸架スプリングと減衰発生機構とを備えた構成であるので、各クッションユニットの部品点数が多くなり、懸架装置全体としての部品コスト、組立コストなどのコストアップに繋がる。
そこで、各クッションユニットの部品点数を抑えるため、懸架装置としての例えば自動二輪車用のフロントフォークとして、ダンパと金属ばねからなる懸架ばねとを内蔵せず、空気ばねからなる懸架ばねを内蔵するクッションユニット（スプリング脚）と、ダンパを内蔵し、金属ばねからなる懸架ばねを内蔵しないクッションユニット（ダンパ脚）と、を平行配置した構成のフロントフォークが知られている（例えば、特許文献２等参照）。 2. Description of the Related Art Conventionally, a rear cushion for, for example, a motorcycle as a suspension device includes a pair of cushion units (for example, see Patent Document 1) having a suspension spring and a damping generation mechanism. However, the rear cushion having a pair of cushion units each having a suspension spring and a damping generation mechanism has a configuration in which each cushion unit has a suspension spring and a damping generation mechanism. The number of points increases, leading to an increase in costs such as parts cost and assembly cost of the entire suspension system.
Therefore, in order to suppress the number of parts of each cushion unit, as a suspension device, for example, a front fork for a motorcycle, a cushion unit that does not include a damper and a suspension spring made of a metal spring but has a suspension spring made of an air spring. A front fork having a configuration in which a (spring leg) and a cushion unit (damper leg) including a damper and not including a suspension spring made of a metal spring are arranged in parallel is known (see, for example, Patent Document 2). .

特開２０１１−１７４５９６号公報JP 2011-174596 A 特開２０１３−１７７１０５号公報JP 2013-177105 A

しかしながら、上述した懸架装置としての自動二輪車用のフロントフォークのような空気ばねからなる懸架ばねにより得られるバネ反力（バネ荷重）だけでは、大きなバネ反力が得られず、大きなバネ反力が必要となる例えば自動二輪車用リアクッション等として使用する懸架装置としては採用し難いという課題があった。 However, a large spring reaction force cannot be obtained only by a spring reaction force (spring load) obtained by a suspension spring composed of an air spring such as a front fork for a motorcycle as the suspension device described above. For example, there is a problem that it is difficult to adopt as a necessary suspension device used as a rear cushion for a motorcycle.

本発明は、各クッションユニットの部品点数を抑えることができてコストダウンを図れるとともに、大きなバネ反力を得ることができる懸架装置を提供する。 The present invention provides a suspension device that can reduce the number of parts of each cushion unit, reduce costs, and obtain a large spring reaction force.

本発明に係る懸架装置は、一対の第１クッションユニットと第２クッションユニットとを備えて車両を懸架する懸架装置であって、前記第１クッションユニットは、その反力により振動を緩衝するバネを有し、前記第２クッションユニットは、その内部に充填された気体と液体とを有すると共に液体の流通により減衰力を発生させる減衰力発生機構を有し、前記第２クッションユニット内の気体が圧縮されることにより生じる反力で前記第１クッションユニットにおける前記バネの反力が補填されて、前記車両を懸架することを特徴とするので、各クッションユニットの部品点数を抑えることができてコストダウンを図れるとともに、第１クッションユニットのバネによる反力と第２クッションユニットの気体ばねによる反力とによる大きなバネ反力を得ることができる。
また、前記第２クッションユニットは、一端側が密封されると共に他端が開口される筒状のアウタチューブと、他端側が密封されると共に一端側が前記アウタチューブの他端開口を介して前記アウタチューブの内側に挿入されたインナチューブと、前記インナチューブの一端近傍に設けられて前記アウタチューブの内周を摺動可能に設けられたピストンとを有し、前記インナチューブと前記アウタチューブとの相対的な移動で前記第２クッションユニットが伸縮され、当該第２クッションユニットの伸縮により気体が圧縮されて気体の反力が生じることを特徴とするので、各クッションユニットの部品点数を抑えることができてコストダウンを図れるとともに、第１クッションユニットのバネによる反力と第２クッションユニットの気体ばねによる反力とによる大きなバネ反力を得ることができる。
また、前記ピストンは、前記インナチューブの一端近傍の外周面を取り囲むように当該外周面に取付けられて前記アウタチューブの内周を摺動する円環状の外側ピストンと、前記インナチューブの一端近傍の内周面に取付けられた円板状の内側ピストンとを備え、前記アウタチューブは、前記第２クッションユニットの伸縮時に前記インナチューブの外周面が摺動する摺動ガイド及び液体シール部材を他端近傍の内側に備え、前記減衰力発生機構は、前記外側ピストンと前記摺動ガイドと前記インナチューブの外周面と前記アウタチューブの内周面とで囲まれた液体流動空間と、前記インナチューブの一端側に形成されて前記液体流動空間と前記インナチューブの内側とに連通する連通孔と、前記内側ピストンに形成されて前記インナチューブの内側と前記アウタチューブの内側とを連通させる常時連通孔及び第１開閉孔と、前記内側ピストンに設けられて前記第１開閉孔を開閉する第１開閉弁と、前記外側ピストンに形成されて前記アウタチューブの内側と前記液体流動空間とを連通させる第２開閉孔と、前記外側ピストンに設けられて前記第２開閉孔を開閉する第２開閉弁とを備え、前記液体流動空間が拡大する圧縮動作時においては、前記第１開閉弁が前記第１開閉孔を閉じるように動作して前記アウタチューブの内側の液体が前記常時連通孔を介して前記インナチューブの内側に流入する際の流路抵抗によって減衰力を発生させ、かつ、前記インナチューブの内側の液体が前記液体流動空間内に流入するとともに、前記第２開閉弁が前記第２開閉孔を開くように動作して前記アウタチューブの内側の液体が当該第２開閉孔を介して前記液体流動空間内に流入し、前記液体流動空間が縮小する伸長動作時においては、前記第２開閉弁が前記第２開閉孔を閉じるように動作して前記液体流動空間内の液体が前記インナチューブの内側に流入する際の流路抵抗によって減衰力を発生させ、かつ、前記第１開閉弁が前記第１開閉孔を開くように動作して前記インナチューブの内側の液体が前記第１開閉孔及び前記常時連通孔を介して前記アウタチューブの内側に流入するように構成されたので、各クッションユニットの部品点数を抑えることができてコストダウンを図れるとともに、第１クッションユニットのバネによる反力と第２クッションユニットの気体ばねによる反力とによる大きなバネ反力が得られ、かつ、第２クッションユニットによって減衰力が得られる。
また、前記第１クッションユニットは、一端側が一端側取付部に固定されて密封されると共に他端が開口される筒状のアウタチューブと、他端側が他端側取付部に固定されて密封されると共に一端側が前記アウタチューブの他端開口を介して前記アウタチューブの内側に挿入されたインナチューブと、前記インナチューブの一端近傍に設けられて前記アウタチューブの内周を摺動可能に設けられたピストンと、前記アウタチューブの内側と前記インナチューブの内側とに跨るように配置されて一端が前記一端側取付部の一端着座部に着座するとともに他端が前記他端側取付部の第１他端着座部に着座するように設けられた内側スプリングと、一端が前記アウタチューブの他端側に形成された一端着座部に着座するとともに他端が前記他端側取付部の第２他端着座部に着座するように設けられた外側スプリングとを備え、前記内側スプリング及び前記外側スプリングが圧縮される圧縮動作時においてこれら内側スプリング及び外側スプリングの反力が発生するように構成されたので、内側スプリング及び外側スプリングによって大きな反力を得ることができる。
また、前記アウタチューブの他端側の一端着座部は、前記外側スプリングの一端側の内周面と前記インナチューブの外周面との間に介在して前記外側スプリングの一端側の内周面と前記インナチューブの外周面との接触を防止する接触防止部を備えたので、第１クッションユニットの伸縮動作時のインナチューブの外周面の擦傷発生防止が図れる。
また、前記インナチューブ及び前記外側スプリングの外周面を覆うための外側覆筒を備え、当該外側覆筒の他端部が前記他端側取付部に着脱自在に取付けられたので、外側スプリング及びインナチューブの表面の擦傷発生防止が図れるとともに、外側覆筒の取付が容易となる。
また、第１クッションユニットの外形と第２クッションユニットの外形とが同じ形状に形成されたので、外観上、２つの同じクッションユニットを備えた懸架装置に見え、外観上は従来と同じで、かつ、各クッションユニットの部品点数を抑えることができてコストダウンが図れるとともに、大きなバネ反力を得ることができる懸架装置となる。 A suspension device according to the present invention is a suspension device that includes a pair of first cushion units and a second cushion unit to suspend a vehicle, and the first cushion unit has a spring that cushions vibrations by the reaction force. The second cushion unit has a damping force generation mechanism that has a gas and a liquid filled therein and generates a damping force by the circulation of the liquid, and the gas in the second cushion unit is compressed. Since the reaction force of the spring in the first cushion unit is compensated by the reaction force generated by the suspension and the vehicle is suspended, the number of parts of each cushion unit can be suppressed and the cost can be reduced. And a large reaction force due to the reaction force by the spring of the first cushion unit and the reaction force by the gas spring of the second cushion unit. It is possible to obtain a value reaction force.
The second cushion unit includes a cylindrical outer tube whose one end side is sealed and the other end is opened, and the other end side is sealed and one end side is opened through the other end opening of the outer tube. An inner tube inserted into the inner tube, and a piston provided near one end of the inner tube so as to be slidable on the inner periphery of the outer tube, and the inner tube and the outer tube Since the second cushion unit is expanded and contracted by a general movement, and the gas is compressed by the expansion and contraction of the second cushion unit, a reaction force of the gas is generated, so that the number of parts of each cushion unit can be suppressed. Cost reduction, and the reaction force by the spring of the first cushion unit and the gas spring of the second cushion unit Large spring reaction force by the reaction force due can be obtained.
The piston is attached to the outer peripheral surface so as to surround the outer peripheral surface in the vicinity of one end of the inner tube and slides on the inner periphery of the outer tube, and the piston in the vicinity of one end of the inner tube. A disc-shaped inner piston attached to the inner peripheral surface, and the outer tube has a sliding guide and a liquid seal member on the other end, on which the outer peripheral surface of the inner tube slides when the second cushion unit expands and contracts. The damping force generation mechanism includes a liquid flow space surrounded by the outer piston, the sliding guide, an outer peripheral surface of the inner tube, and an inner peripheral surface of the outer tube, and an inner tube of the inner tube. A communication hole formed on one end side to communicate with the liquid flow space and the inner tube; and an inner piston formed on the inner piston. A first communication hole and a first opening / closing hole for communicating between the inside of the outer tube and the inside of the outer tube, a first opening / closing valve provided in the inner piston for opening / closing the first opening / closing hole, and the outer piston. A second opening / closing hole that communicates the inside of the outer tube with the liquid flow space; and a second opening / closing valve that is provided in the outer piston and opens / closes the second opening / closing hole. During the compression operation, the first on-off valve operates so as to close the first on-off hole, and the flow when the liquid inside the outer tube flows into the inner tube through the constant communication hole. A damping force is generated by the path resistance, the liquid inside the inner tube flows into the liquid flow space, and the second opening / closing valve operates to open the second opening / closing hole. When the liquid inside the outer tube flows into the liquid flow space through the second opening / closing hole and the liquid flow space is contracted, the second opening / closing valve closes the second opening / closing hole. So that a damping force is generated by the flow resistance when the liquid in the liquid flow space flows into the inner tube, and the first opening / closing valve opens the first opening / closing hole. Since it is configured such that the liquid inside the inner tube flows into the outer tube through the first opening / closing hole and the continuous communication hole, the number of parts of each cushion unit can be suppressed. The cost can be reduced and a large spring reaction force can be obtained by the reaction force of the first cushion unit and the reaction force of the second cushion unit by the gas spring. Damping force is obtained by the cushion unit.
The first cushion unit has a cylindrical outer tube whose one end is fixed to the one end mounting portion and sealed and the other end is opened, and the other end is fixed to the other end mounting portion and sealed. One end side of the inner tube is inserted inside the outer tube through the other end opening of the outer tube, and the inner tube is provided near one end of the inner tube so as to be slidable on the inner periphery of the outer tube. The other end is seated on one end seating portion of the one end side mounting portion and the other end is the first end of the other end side mounting portion. The piston is disposed so as to straddle the inner side of the outer tube and the inner tube. An inner spring provided so as to be seated on the other end seating portion, and one end seated on the one end seating portion formed on the other end side of the outer tube and the other end on the other end side And an outer spring provided so as to be seated on the second other end seating portion, and the reaction force of the inner spring and the outer spring is generated during the compression operation in which the inner spring and the outer spring are compressed. Therefore, a large reaction force can be obtained by the inner spring and the outer spring.
The one end seating portion on the other end side of the outer tube is interposed between the inner peripheral surface on one end side of the outer spring and the outer peripheral surface of the inner tube, and the inner peripheral surface on one end side of the outer spring. Since the contact prevention part which prevents a contact with the outer peripheral surface of the said inner tube is provided, the generation | occurrence | production of the abrasion of the outer peripheral surface of the inner tube at the time of expansion-contraction operation | movement of a 1st cushion unit can be aimed at.
In addition, since the outer cover cylinder for covering the outer peripheral surface of the inner tube and the outer spring is provided, and the other end portion of the outer cover cylinder is detachably attached to the other end side attachment portion, the outer spring and the inner spring It is possible to prevent generation of scratches on the surface of the tube and to easily attach the outer cover tube.
In addition, since the outer shape of the first cushion unit and the outer shape of the second cushion unit are formed in the same shape, it looks like a suspension device having two identical cushion units in appearance, the appearance is the same as the conventional one, and The suspension unit can reduce the number of parts of each cushion unit, reduce the cost, and obtain a large spring reaction force.

緩衝装置を示す断面図。Sectional drawing which shows a buffering device. 第１クッションユニットの要部拡大断面図。The principal part expanded sectional view of a 1st cushion unit. 第２クッションユニットの圧縮動作時の要部拡大断面図。The principal part expanded sectional view at the time of compression operation of the 2nd cushion unit. 第２クッションユニットの伸長動作時の要部拡大断面図。The principal part expanded sectional view at the time of expansion | extension operation | movement of a 2nd cushion unit.

図１乃至図４に基づいて実施形態１の懸架装置について説明する。
尚、本明細書においては、図１乃至図４において矢印で示した側を一端側及び他端側と定義して説明する。 The suspension device according to the first embodiment will be described with reference to FIGS. 1 to 4.
In this specification, the sides indicated by arrows in FIGS. 1 to 4 are defined as one end side and the other end side.

図１に示すように、懸架装置１は、一対のクッションユニットである第１クッションユニット１Ａと第２クッションユニット１Ｂとを備えた構成である。
懸架装置１は、反力により振動を緩衝する懸架バネとしての固体バネを有した第１クッションユニット１Ａと、内部に充填された気体と液体とを有すると共に液体の流通により減衰力を発生させる減衰力発生機構とを有した第２クッションユニット１Ｂとを備え、懸架装置１の圧縮動作時においては、第２クッションユニット１Ｂ内の空気が圧縮されることにより生じる気体ばねの反力で第１クッションユニット１Ａの固体バネの反力が補填されるように構成されている。
気体バネは、第２クッションユニット１Ｂの内部に気体が気密状態に収容されることにより形成される。
減衰力発生機構は、第２クッションユニット１Ｂの内部に液体が液密状態に収容され、当該液体が第２クッションユニット１Ｂの内部に形成された流路を第２クッションユニット１Ｂの伸縮動作時に通過する際の抵抗により減衰力を発生させる構成である。
尚、例えば、気体は空気であり、液体はオイルであり、固体バネは金属やグラスファイバー等により形成される。 As shown in FIG. 1, the suspension device 1 includes a first cushion unit 1A and a second cushion unit 1B that are a pair of cushion units.
The suspension device 1 includes a first cushion unit 1A having a solid spring as a suspension spring that buffers vibrations by a reaction force, a gas and a liquid filled therein, and a damping that generates a damping force by the circulation of the liquid. And a second cushion unit 1B having a force generation mechanism. When the suspension device 1 is compressed, the first cushion is caused by the reaction force of the gas spring generated by the compression of the air in the second cushion unit 1B. It is comprised so that the reaction force of the solid spring of unit 1A may be supplemented.
The gas spring is formed by accommodating gas in an airtight state inside the second cushion unit 1B.
The damping force generation mechanism stores liquid in a liquid-tight state inside the second cushion unit 1B, and the liquid passes through a flow path formed inside the second cushion unit 1B during the expansion and contraction operation of the second cushion unit 1B. The damping force is generated by the resistance when
For example, the gas is air, the liquid is oil, and the solid spring is formed of metal, glass fiber, or the like.

即ち、懸架装置１は、圧縮動作時において、第１クッションユニット１Ａの固体バネによる反力と第２クッションユニット１Ｂの気体バネの反力とが得られるように構成され、大きなバネ反力が必要な例えば自動二輪車用のリアクッションとして用いられる。 That is, the suspension device 1 is configured to obtain a reaction force by the solid spring of the first cushion unit 1A and a reaction force of the gas spring of the second cushion unit 1B during the compression operation, and requires a large spring reaction force. For example, it is used as a rear cushion for a motorcycle.

図１に示すように、第１クッションユニット１Ａは、円筒状に形成されたアウタチューブ２と、一端側取付部３と、円筒状に形成されたインナチューブ４と、他端側取付部５と、円筒状に形成された外側覆筒６と、アウタチューブ２の他端近傍の内側に固定された摺動ガイド７と、インナチューブ４の一端近傍の外側に固定された円環状ピストン８と、固体バネとしての内側スプリング９と、固体バネとしての外側スプリング１０とが組み合わされて構成される。 As shown in FIG. 1, the first cushion unit 1 A includes an outer tube 2 formed in a cylindrical shape, one end side mounting portion 3, an inner tube 4 formed in a cylindrical shape, and the other end side mounting portion 5. A cylindrical outer cover 6, a sliding guide 7 fixed on the inner side near the other end of the outer tube 2, an annular piston 8 fixed on the outer side near one end of the inner tube 4, An inner spring 9 as a solid spring is combined with an outer spring 10 as a solid spring.

アウタチューブ２、インナチューブ４、及び、外側覆筒６は、例えば金属により形成された円筒体により構成される。筒の径の大きさの関係は、外側覆筒６＞アウタチューブ２＞インナチューブ４である。 The outer tube 2, the inner tube 4, and the outer cover cylinder 6 are configured by a cylindrical body made of, for example, metal. The relationship between the diameters of the cylinders is that the outer cover cylinder 6> the outer tube 2> the inner tube 4.

アウタチューブ２の一端開口１１が密封状態に塞がれた状態となるようにアウタチューブ２の一端側が一端側取付部３に固定されるとともに、インナチューブ４の一端開口１２側がアウタチューブ２の他端開口１３を介してアウタチューブ２の内側に挿入されてインナチューブ４の他端開口１４が塞がれた状態となるようにインナチューブ４の他端側が他端側取付部５に固定されている。 One end side of the outer tube 2 is fixed to the one end side mounting portion 3 so that the one end opening 11 of the outer tube 2 is sealed in a sealed state, and the one end opening 12 side of the inner tube 4 is the other side of the outer tube 2. The other end side of the inner tube 4 is fixed to the other end side attachment portion 5 so as to be inserted into the outer tube 2 through the end opening 13 and the other end opening 14 of the inner tube 4 is closed. Yes.

アウタチューブ２の他端近傍の内周面２ｂにはアウタチューブ２の他端開口１３を介して挿入されたインナチューブ４の外周面４ａと摺動する摺動ガイド７が例えば加締め固定されており、アウタチューブ２の他端開口１３を介してアウタチューブ２の内側に挿入されたインナチューブ４の一端開口１２の近傍の外周面４ｂにはアウタチューブ２の内周面２ａと摺動する円環状ピストン８が例えば加締め固定されている。 On the inner peripheral surface 2b in the vicinity of the other end of the outer tube 2, a sliding guide 7 that slides on the outer peripheral surface 4a of the inner tube 4 inserted through the other end opening 13 of the outer tube 2 is fixed by caulking, for example. The outer peripheral surface 4b in the vicinity of the one end opening 12 of the inner tube 4 inserted inside the outer tube 2 through the other end opening 13 of the outer tube 2 is a circle that slides with the inner peripheral surface 2a of the outer tube 2. An annular piston 8 is fixed by caulking, for example.

アウタチューブ２は、他端近傍の内周面２ｂ及び一端近傍の内周面２ｃの径寸法が、他端近傍の内周面２ｂと一端近傍の内周面２ｃとの間の内周面２ａの径寸法よりも大きい寸法に形成される。そして、内周面２ａと他端近傍の内周面２ｂとの段差面は、アウタチューブ２の中心線２Ｃを中心とした円環平面２ｄに形成される。 The outer tube 2 has an inner circumferential surface 2a between the inner circumferential surface 2b near the other end and the inner circumferential surface 2c near the other end. It is formed in a dimension larger than the diameter dimension. A step surface between the inner peripheral surface 2 a and the inner peripheral surface 2 b near the other end is formed on an annular plane 2 d centering on the center line 2 C of the outer tube 2.

図２に示すように、摺動ガイド７は、他端部の外周面の径がその他の部分の外周面の径よりも小径に形成された段付き円柱体の中央に当該段付き円柱体の中心線に沿って延長する貫通孔７ｃが形成された構成である。即ち、摺動ガイド７は、他端部が小外径部７ａに形成され、その他の部分が大外径部７ｂに形成された段付き円柱体の中心に貫通孔７ｃを備えた構成である。 As shown in FIG. 2, the sliding guide 7 has a stepped cylinder at the center of the stepped cylinder formed with a diameter of the outer peripheral surface of the other end smaller than that of the other part. In this configuration, a through hole 7c extending along the center line is formed. That is, the sliding guide 7 has a configuration in which a through-hole 7c is provided at the center of a stepped cylinder having the other end portion formed in the small outer diameter portion 7a and the other portion formed in the large outer diameter portion 7b. .

摺動ガイド７は、大外径部７ｂの外周面とアウタチューブ２の他端近傍の内周面２ｂとが嵌まり合うように大外径部７ｂがアウタチューブ２の他端開口１３側の内側に嵌め込まれて大外径部７ｂの一端面７ｄがアウタチューブ２の円環平面２ｄに載置された状態で、大外径部７ｂの他端面７ｅよりも他端側に突出するアウタチューブ２の他端開口縁部分２ｔが大外径部７ｂの他端面７ｅに密着するように形成されたことで、アウタチューブ２の他端近傍の内側に、アウタチューブ２と同軸状（摺動ガイド７の中心線とアウタチューブ２の中心線２Ｃとが一致した状態）に固定されている。
この場合、アウタチューブ２の内周面２ｂの他端開口縁部分２ｔ側と大外径部７ｂの外周面とが密着し、かつ、アウタチューブ２の他端開口縁部分２ｔが大外径部７ｂの外周面と他端面７ｅとの境界縁部で折曲されて折曲された他端開口縁部分２ｔと大外径部７ｂの他端面７ｅとが密着するように、例えばローリング加締め機でローリング加締め加工されることによって、アウタチューブ２の他端近傍の内側に摺動ガイド７が固定される。 The sliding guide 7 has a large outer diameter portion 7b on the other end opening 13 side of the outer tube 2 so that the outer peripheral surface of the large outer diameter portion 7b and the inner peripheral surface 2b in the vicinity of the other end of the outer tube 2 are fitted together. The outer tube that is fitted inside and protrudes to the other end side from the other end surface 7e of the large outer diameter portion 7b in a state where the one end surface 7d of the large outer diameter portion 7b is placed on the annular plane 2d of the outer tube 2. 2 is formed so that the other end opening edge portion 2t is in close contact with the other end surface 7e of the large outer diameter portion 7b, so that it is coaxial with the outer tube 2 on the inner side in the vicinity of the other end of the outer tube 2 (sliding guide). 7 and the center line 2C of the outer tube 2 are fixed to each other).
In this case, the other end opening edge portion 2t side of the inner peripheral surface 2b of the outer tube 2 is in close contact with the outer peripheral surface of the large outer diameter portion 7b, and the other end opening edge portion 2t of the outer tube 2 is the large outer diameter portion. For example, a rolling caulking machine is used so that the other end opening edge portion 2t bent at the boundary edge between the outer peripheral surface of 7b and the other end surface 7e is in close contact with the other end surface 7e of the large outer diameter portion 7b. The sliding guide 7 is fixed inside the vicinity of the other end of the outer tube 2 by rolling caulking.

図１に示すように、インナチューブ４は、一端近傍の外周面４ｂの径寸法が、一端近傍の外周面４ｂと他端近傍の外周面４ｃとの間の外周面４ａの径寸法よりも小さい寸法に形成される。また、他端近傍の外周面４ｃの径寸法は、外周面４ａと同等径に形成され、他端近傍の外周面４ｃには、後述する他端側取付部５のインナチューブ嵌合部５ａの内周面に形成されたねじ部とねじ嵌合されるねじ部が形成されている。そして、外周面４ａと一端近傍の外周面４ｂとの段差面は、インナチューブ４の中心線を中心とした円環平面４ｄに形成される。 As shown in FIG. 1, the inner tube 4 has a diameter dimension of the outer peripheral surface 4 b near one end smaller than a diameter dimension of the outer peripheral surface 4 a between the outer peripheral surface 4 b near one end and the outer peripheral surface 4 c near the other end. Formed into dimensions. Further, the outer peripheral surface 4c in the vicinity of the other end is formed to have the same diameter as that of the outer peripheral surface 4a. The outer peripheral surface 4c in the vicinity of the other end is provided with an inner tube fitting portion 5a of the other end side mounting portion 5 described later. A screw portion that is screw-fitted with a screw portion formed on the inner peripheral surface is formed. A step surface between the outer peripheral surface 4 a and the outer peripheral surface 4 b near one end is formed on an annular plane 4 d centering on the center line of the inner tube 4.

図２に示すように、円環状ピストン８は、円柱体の中央に円柱体の中心線に沿って延長する貫通孔８ｃが形成された構成であり、貫通孔８ｃの内周面の径寸法がインナチューブ４の一端近傍の外周面４ｂに嵌まり込む寸法に形成され、外周面８ｆの径寸法がアウタチューブ２の内周面２ａの径寸法に対応した寸法に形成されている。 As shown in FIG. 2, the annular piston 8 has a configuration in which a through hole 8c extending along the center line of the cylindrical body is formed in the center of the cylindrical body, and the diameter of the inner peripheral surface of the through hole 8c is the same. The inner tube 4 is formed to fit into the outer peripheral surface 4 b near one end, and the outer peripheral surface 8 f has a diameter corresponding to the diameter of the inner peripheral surface 2 a of the outer tube 2.

円環状ピストン８は、貫通孔８ｃの内周面がインナチューブ４の一端近傍の外周面４ｂに嵌め込まれて他端面８ｅがインナチューブ４の円環平面４ｄに載置された状態で、一端面８ｄよりも一端側に突出するインナチューブ４の一端開口縁部分４ｔが一端面８ｄに密着するように形成されたことで、インナチューブ４の一端近傍の外側に、インナチューブ４と同軸状（円環状ピストン８の中心線とインナチューブ４の中心線とが一致した状態）に固定されている。
この場合、インナチューブ４の外周面４ｂの一端開口縁部分４ｔ側と円環状ピストン８の内周面とが密着し、かつ、インナチューブ４の一端開口縁部分４ｔが円環状ピストン８の内周面と一端面８ｄとの境界縁部で折曲されて折曲された一端開口縁部分４ｔと円環状ピストン８の一端面８ｄとが密着するように、例えばローリング加締め機でローリング加締め加工されることによって、インナチューブ４の一端近傍の外側に円環状ピストン８が固定される。 The annular piston 8 has one end face in a state where the inner peripheral face of the through hole 8 c is fitted into the outer peripheral face 4 b near one end of the inner tube 4 and the other end face 8 e is placed on the annular plane 4 d of the inner tube 4. Since the one end opening edge portion 4t of the inner tube 4 protruding to one end side from 8d is formed so as to be in close contact with the one end surface 8d, the inner tube 4 is coaxial with the inner tube 4 on the outer side in the vicinity of one end (circular shape). The center line of the annular piston 8 and the center line of the inner tube 4 are fixed to each other.
In this case, the one end opening edge portion 4t side of the outer peripheral surface 4b of the inner tube 4 and the inner peripheral surface of the annular piston 8 are in close contact, and the one end opening edge portion 4t of the inner tube 4 is the inner periphery of the annular piston 8. For example, a rolling caulking machine is used for rolling caulking so that the one end opening edge portion 4t that is bent at the boundary edge between the surface and the one end surface 8d and the one end surface 8d of the annular piston 8 are in close contact with each other. As a result, the annular piston 8 is fixed to the outside near one end of the inner tube 4.

以上のようにして、第１クッションユニット１Ａは、アウタチューブ２の一端とインナチューブ４の一端とが互いに近づく方向にアウタチューブ２とインナチューブ４とが相対的に移動する圧縮動作、及び、アウタチューブ２の一端とインナチューブ４の一端とが互いに離れる方向にアウタチューブ２とインナチューブ４とが相対的に移動する伸長動作とが可能なように構成されている。尚、伸縮動作時におけるインナチューブ４の外周面４ａと摺動ガイド７との摺動性能を向上させるために、インナチューブ４の外周面４ａの外周面又は摺動ガイド７の貫通孔７ｃの内周面にはグリスが塗布されている。また、伸縮動作時における円環状ピストン８の外周面８ｆとアウタチューブ２の内周面２ａとの摺動性能を向上させるために、円環状ピストン８の外周面８ｆ又はアウタチューブ２の内周面２ａにはグリスが塗布されている。 As described above, the first cushion unit 1A includes a compression operation in which the outer tube 2 and the inner tube 4 relatively move in a direction in which one end of the outer tube 2 and one end of the inner tube 4 approach each other, and the outer The outer tube 2 and the inner tube 4 are configured so as to be able to perform an extending operation in which the outer tube 2 and the inner tube 4 move relatively in a direction in which one end of the tube 2 and one end of the inner tube 4 are separated from each other. In order to improve the sliding performance between the outer peripheral surface 4a of the inner tube 4 and the sliding guide 7 during the expansion / contraction operation, the outer peripheral surface of the outer peripheral surface 4a of the inner tube 4 or the inside of the through hole 7c of the sliding guide 7 is used. Grease is applied to the peripheral surface. Further, in order to improve the sliding performance between the outer peripheral surface 8f of the annular piston 8 and the inner peripheral surface 2a of the outer tube 2 during the expansion / contraction operation, the outer peripheral surface 8f of the annular piston 8 or the inner peripheral surface of the outer tube 2 is used. Grease is applied to 2a.

そして、図１に示すように、内側スプリング９がアウタチューブ２の内側とインナチューブ４の内側とに跨がって配置されて内側スプリング９の一端が一端側取付部３の一端着座部３ｇに着座するとともに内側スプリング９の他端が他端側取付部５の第１他端着座部としての内側他端着座部５ｇに着座するように設置され、かつ、外側スプリング１０がインナチューブ４の外周面を螺旋状に取り囲んで延長するように配置されて外側スプリング１０の一端がアウタチューブ２の他端側の一端着座部２ｈに着座するとともに外側スプリング１０の他端が他端側取付部５の第２他端着座部としての外側他端着座部５ｈに着座するように設置されたことによって、内側スプリング９及び外側スプリング１０が圧縮される第１クッションユニット１Ａの圧縮動作時においてこれら内側スプリング９及び外側スプリング１０の反力が発生するように構成されている。 As shown in FIG. 1, the inner spring 9 is disposed across the inner side of the outer tube 2 and the inner side of the inner tube 4, and one end of the inner spring 9 is attached to the one-end seating portion 3 g of the one-end-side mounting portion 3. It is installed so that the other end of the inner spring 9 is seated on the inner other end seating portion 5g as the first other end seating portion of the other end side mounting portion 5, and the outer spring 10 is the outer periphery of the inner tube 4. One end of the outer spring 10 is seated on one end seating portion 2 h on the other end side of the outer tube 2, and the other end of the outer spring 10 is disposed on the other end side mounting portion 5. The first cushion unit 1A in which the inner spring 9 and the outer spring 10 are compressed by being installed so as to be seated on the outer other end seating portion 5h as the second other end seating portion. The reaction force of the inner spring 9 and the outer spring 10 during the compression operation is configured to generate.

外側スプリング１０の一端側の内周面１０ａとインナチューブ４の外周面４ａとの間に、アウタチューブ２の他端開口１３より他端側に突出する摺動ガイド７の小外径部７ａが設けられたことにより、外側スプリング１０の一端側の内周面１０ａとインナチューブ４の外周面４ａとが離間するように構成されている。即ち、外側スプリング１０の一端着座部２ｈは、外側スプリング１０の一端側の内周面１０ａとインナチューブ４の外周面４ａとの間に介在して外側スプリング１０の一端側の内周面１０ａとインナチューブ４の外周面４ａとの接触を防止する接触防止部として機能する摺動ガイド７の他端部としての小外径部７ａを備えたので、第１クッションユニット１Ａの伸縮動作時のインナチューブ４の外周面４ａの擦傷発生防止が図れる。 A small outer diameter portion 7 a of the sliding guide 7 protruding from the other end opening 13 of the outer tube 2 to the other end side is provided between the inner peripheral surface 10 a on one end side of the outer spring 10 and the outer peripheral surface 4 a of the inner tube 4. By being provided, the inner peripheral surface 10a on one end side of the outer spring 10 and the outer peripheral surface 4a of the inner tube 4 are configured to be separated from each other. That is, the one end seating portion 2 h of the outer spring 10 is interposed between the inner peripheral surface 10 a on one end side of the outer spring 10 and the outer peripheral surface 4 a of the inner tube 4, and the inner peripheral surface 10 a on one end side of the outer spring 10. Since the small outer diameter portion 7a is provided as the other end portion of the sliding guide 7 that functions as a contact preventing portion that prevents contact with the outer peripheral surface 4a of the inner tube 4, the inner portion when the first cushion unit 1A is extended and contracted. It is possible to prevent the outer peripheral surface 4a of the tube 4 from being scratched.

一端側取付部３は、アウタチューブ２の一端開口１１側の内周面２ｃに嵌合するアウタチューブ嵌合部３ａと、取付対象への取付孔３ｂを有した取付部３ｃとを備え、アウタチューブ２の一端開口１１側の内周面２ｃがアウタチューブ嵌合部３ａに嵌合された状態で溶接によりアウタチューブ２の一端開口１１側が一端側取付部３に固定される。 The one end side attachment portion 3 includes an outer tube fitting portion 3a that fits to the inner peripheral surface 2c on the one end opening 11 side of the outer tube 2, and an attachment portion 3c having an attachment hole 3b for attachment. The one end opening 11 side of the outer tube 2 is fixed to the one end side mounting portion 3 by welding in a state where the inner peripheral surface 2c on the one end opening 11 side of the tube 2 is fitted to the outer tube fitting portion 3a.

他端側取付部５は、インナチューブ４の他端開口１４側の外周面４ｃとねじ嵌合するインナチューブ嵌合部５ａと、取付対象への取付孔５ｂを有した取付部５ｃと、外側覆筒６の他端側内周面に嵌合される外側覆筒嵌合部５ｄとを備え、インナチューブ４の他端開口１４側の外周面４ｃがインナチューブ嵌合部５ａにねじ嵌合されたことでインナチューブ４の他端開口１４側が他端側取付部５に固定される。 The other end side attachment portion 5 includes an inner tube fitting portion 5a that is screw-fitted to the outer peripheral surface 4c on the other end opening 14 side of the inner tube 4, an attachment portion 5c that has an attachment hole 5b to be attached, and an outer side. An outer cover tube fitting portion 5d to be fitted to the inner peripheral surface of the other end side of the cover tube 6, and the outer peripheral surface 4c on the other end opening 14 side of the inner tube 4 is screwed to the inner tube fit portion 5a. As a result, the other end opening 14 side of the inner tube 4 is fixed to the other end side attachment portion 5.

外側覆筒６は、他端側取付部５の外側覆筒嵌合部５ｄに取付けられる取付部６ａと、取付部以外の部分であってインナチューブ４の外周面、外側スプリング１０の外周面及びインナチューブ４の他端側外周面を覆う覆筒部６ｂとを備える。
取付部６ａは、外側覆筒嵌合部５ｄの外周面に形成された円環状溝に係合する係合環状部６ｃを備える。取付部６ａは、他端から外側覆筒６の中心線に沿って延長するように形成された図外の切割部を備えており、この切割部を介して取付部６ａの内径が拡径するように形成されていることにより、係合環状部６ｃを外側覆筒嵌合部５ｄの円環状溝に着脱自在に係合させて取付けることができるようになっているので、外側覆筒６の取付が容易となる。
覆筒部６ｂの内周面の径寸法は、外側スプリング１０の外周面及びインナチューブ４の外周面の径寸法よりも大きい寸法に形成されている。
このように、外側覆筒６の他端側が他端側取付部５に固定され、外側覆筒６が外側スプリング１０及びインナチューブ４の外周面４ａを覆うように設けられているので、外側スプリング１０及びインナチューブ４の表面の擦傷発生防止が図れる。 The outer cover tube 6 includes a mounting portion 6a attached to the outer cover tube fitting portion 5d of the other end side mounting portion 5, a portion other than the mounting portion, the outer peripheral surface of the inner tube 4, the outer peripheral surface of the outer spring 10, and And a covered cylinder portion 6b that covers the outer peripheral surface of the other end side of the inner tube 4.
The attachment portion 6a includes an engagement annular portion 6c that engages with an annular groove formed on the outer peripheral surface of the outer cover tube fitting portion 5d. The attachment portion 6a includes a not-shown cut portion formed so as to extend from the other end along the center line of the outer cover cylinder 6, and the inner diameter of the attachment portion 6a is expanded through the cut portion. Since the engagement annular portion 6c can be detachably engaged with the annular groove of the outer cover tube fitting portion 5d and attached, the outer cover tube 6 can be attached. Installation is easy.
The diameter of the inner peripheral surface of the cover tube portion 6 b is larger than the diameter of the outer peripheral surface of the outer spring 10 and the outer peripheral surface of the inner tube 4.
Thus, the other end side of the outer cover cylinder 6 is fixed to the other end side mounting portion 5, and the outer cover cylinder 6 is provided so as to cover the outer spring 10 and the outer peripheral surface 4 a of the inner tube 4. 10 and the surface of the inner tube 4 can be prevented from being scratched.

図１に示すように、第２クッションユニット１Ｂは、円筒状に形成されたアウタチューブ２０と、一端側取付部３０と、円筒状に形成されたインナチューブ４０と、他端側取付部５０と、円筒状に形成された外側覆筒６０と、アウタチューブ２０の他端近傍の内側に固定された摺動ガイド７０と、インナチューブ４０の一端近傍に固定されたピストン８０と、減衰力発生機構とが組み合わされて構成される。
アウタチューブ２０、インナチューブ４０、及び、外側覆筒６０は、例えば金属により形成された円筒体により構成される。筒の径の大きさの関係は、外側覆筒６０＞アウタチューブ２０＞インナチューブ４０である。
即ち、第２クッションユニット１Ｂは、アウタチューブ２０の一端開口２１が密封されて塞がれた状態となるようにアウタチューブ２０の一端側が一端側取付部３０に固定されるとともに、インナチューブ４０の一端開口２２側がアウタチューブ２０の他端開口２３を介してアウタチューブ２０の内側に挿入されてインナチューブ４０の他端開口２４が密封されて塞がれた状態となるようにインナチューブ４０の他端側が他端側取付部５０に固定されている。
そして、アウタチューブ２０の他端近傍の内側にはアウタチューブ２０の他端開口２３を介して挿入されたインナチューブ４０の外周面４０ａと摺動する摺動ガイド７０及びシール部材７１が設けられており、アウタチューブ２０の他端開口２３を介してアウタチューブ２０の内側に挿入されたインナチューブ４０の一端開口２２の近傍にはアウタチューブ２０の内周面２０ａと摺動するピストン８０が設けられている。 As shown in FIG. 1, the second cushion unit 1 B includes an outer tube 20 formed in a cylindrical shape, one end side mounting portion 30, an inner tube 40 formed in a cylindrical shape, and the other end side mounting portion 50. The outer cover cylinder 60 formed in a cylindrical shape, the sliding guide 70 fixed inside the vicinity of the other end of the outer tube 20, the piston 80 fixed near one end of the inner tube 40, and the damping force generation mechanism Are combined.
The outer tube 20, the inner tube 40, and the outer cover cylinder 60 are configured by a cylindrical body formed of, for example, metal. The relationship between the diameters of the cylinders is that the outer cover cylinder 60> the outer tube 20> the inner tube 40.
That is, in the second cushion unit 1B, the one end side of the outer tube 20 is fixed to the one end side mounting portion 30 so that the one end opening 21 of the outer tube 20 is sealed and closed, and the inner tube 40 The other end of the inner tube 40 is such that the one end opening 22 side is inserted into the outer tube 20 through the other end opening 23 of the outer tube 20 and the other end opening 24 of the inner tube 40 is sealed and closed. The end side is fixed to the other end side mounting portion 50.
A sliding guide 70 and a seal member 71 are provided on the inner side of the outer tube 20 in the vicinity of the other end of the outer tube 20 to slide with the outer peripheral surface 40a of the inner tube 40 inserted through the other end opening 23 of the outer tube 20. In the vicinity of one end opening 22 of the inner tube 40 inserted inside the outer tube 20 through the other end opening 23 of the outer tube 20, a piston 80 that slides with the inner peripheral surface 20a of the outer tube 20 is provided. ing.

即ち、第２クッションユニット１Ｂは、アウタチューブ２０の一端とインナチューブ４０の一端とが互いに近づく方向にアウタチューブ２０とインナチューブ４０とが相対的に移動する圧縮動作、及び、アウタチューブ２０の一端とインナチューブ４０の一端とが互いに離れる方向にアウタチューブ２０とインナチューブ４０とが相対的に移動する伸長動作とが可能に構成されている。 That is, the second cushion unit 1B includes a compression operation in which the outer tube 20 and the inner tube 40 move relatively in a direction in which one end of the outer tube 20 and one end of the inner tube 40 approach each other, and one end of the outer tube 20 The outer tube 20 and the inner tube 40 are configured such that the outer tube 20 and the inner tube 40 can move relative to each other in a direction away from each other.

一端側取付部３０は、アウタチューブ２０の一端開口２１側の内周面２０ｃに嵌合するアウタチューブ嵌合部３０ａと、取付対象への取付孔３０ｂを有した取付部３０ｃとを備え、アウタチューブ２０の一端開口２１側の内周面２０ｃがアウタチューブ嵌合部３０ａに嵌合された状態で溶接によりアウタチューブ２０の一端開口２１側が一端側取付部３０に固定される。尚、アウタチューブ２０の一端開口側の内側には、嵌合部３０ａと接触するように配置されて、インナチューブ４０の一端と一端側取付部３０との衝突を防止する緩衝材としてのバンプラバー３１を備える。
他端側取付部５０は、インナチューブ４０の他端開口２４側の外周面４０ｃとねじ嵌合するインナチューブ嵌合部５０ａと、取付対象への取付孔５０ｂを有した取付部５０ｃと、外側覆筒６０の他端側内周面に嵌合される外側覆筒嵌合部５０ｄとを備え、インナチューブ４０の他端開口２４側の外周面４０ｃがインナチューブ嵌合部５０ａにねじ嵌合されたことでインナチューブ４０の他端開口２４側が他端側取付部５０に固定される。尚、インナチューブ４０の他端近傍の外周面はねじが形成されておらず、当該外周面に嵌まり込むインナチューブ嵌合部５０ａ内周面に形成された環状装着溝内にはＯリング等のシール部材５１が装着されている。 The one end side attachment portion 30 includes an outer tube fitting portion 30a that fits to the inner peripheral surface 20c on the one end opening 21 side of the outer tube 20, and an attachment portion 30c having an attachment hole 30b for attachment. The one end opening 21 side of the outer tube 20 is fixed to the one end side mounting portion 30 by welding in a state where the inner peripheral surface 20c on the one end opening 21 side of the tube 20 is fitted to the outer tube fitting portion 30a. A bump rubber as a cushioning material is disposed on the inner side of the one end opening side of the outer tube 20 so as to be in contact with the fitting portion 30a and prevents collision between one end of the inner tube 40 and the one end side mounting portion 30. 31 is provided.
The other end side mounting portion 50 includes an inner tube fitting portion 50a that is screwed to the outer peripheral surface 40c on the other end opening 24 side of the inner tube 40, a mounting portion 50c that has a mounting hole 50b for mounting, and an outer side. An outer cover tube fitting portion 50d fitted to the inner peripheral surface of the other end side of the cover tube 60, and the outer peripheral surface 40c on the other end opening 24 side of the inner tube 40 is screwed to the inner tube fitting portion 50a. As a result, the other end opening 24 side of the inner tube 40 is fixed to the other end side mounting portion 50. The outer peripheral surface in the vicinity of the other end of the inner tube 40 is not threaded, and an O-ring or the like is formed in an annular mounting groove formed on the inner peripheral surface of the inner tube fitting portion 50a that fits into the outer peripheral surface. The seal member 51 is mounted.

第２クッションユニット１Ｂのアウタチューブ２０の内側及びインナチューブ４０の内側の一端側には液体としてのオイル４１が液密状態に収容され、かつ、インナチューブ４０の内側の他端側には気体としての空気４２が気密状態に収容されている。
即ち、後述する液体シール部材としてのオイルシール等のシール部材７１により、アウタチューブ２０内にオイルが液密状態に充填された状態となっており、かつ、Ｏリング等のシール部材５１により、インナチューブ４０内に空気４２が気密状態に充填されるとともにオイル４１が液密状態に充填された状態となっている。
このため、第２クッションユニット１Ｂは、インナチューブ４０とアウタチューブ２０との相対的な移動による伸縮動作によって、インナチューブ４０内の空気４２が圧縮されて空気の反力を生じさせる空気ばねと、オイル４１の流動抵抗による減衰力を生じさせる減衰力発生機構と、を備えた構成となっている。 Oil 41 as a liquid is housed in a liquid-tight state at one end of the inner tube 40 and the inner tube 40 of the second cushion unit 1B, and as gas at the other end of the inner tube 40. The air 42 is housed in an airtight state.
That is, the outer tube 20 is filled with oil in a liquid-tight state by a seal member 71 such as an oil seal as a liquid seal member described later, and the inner member is sealed by a seal member 51 such as an O-ring. The tube 40 is filled with air 42 in an airtight state and oil 41 is filled in a liquidtight state.
For this reason, the second cushion unit 1B includes an air spring in which the air 42 in the inner tube 40 is compressed to generate a reaction force of the air by an expansion and contraction operation by relative movement of the inner tube 40 and the outer tube 20; And a damping force generation mechanism that generates a damping force due to the flow resistance of the oil 41.

外側覆筒６０は、他端側取付部５０の外側覆筒嵌合部５０ｄに取付けられる取付部６０ａと、取付部６０ａ以外の部分であってインナチューブ４０の外周面４０ａ及びアウタチューブ２０の他端側外周面を覆う覆筒部６０ｂとを備える。
取付部６０ａは、外側覆筒嵌合部５０ｄの外周面に形成された円環状溝に係合する係合環状部６０ｃを備える。取付部６０ａは、他端から外側覆筒６０の中心線に沿って延長するように形成された図外の切割部を備えており、この切割部を介して取付部６０ａの内径が拡径するように形成されていることにより、係合環状部６０ｃを外側覆筒嵌合部５０ｄの円環状溝に着脱自在に係合させて取付けることができるようになっているので、外側覆筒６０の取付が容易となる。
このように、外側覆筒６０の他端側が他端側取付部５０に固定され、外側覆筒６０がインナチューブ４０の外周面４０ａを覆うように設けられているので、インナチューブ４０の表面の擦傷発生防止が図れる。 The outer cover tube 60 includes a mounting portion 60a attached to the outer cover tube fitting portion 50d of the other end side mounting portion 50, a portion other than the mounting portion 60a, and the outer peripheral surface 40a of the inner tube 40 and the outer tube 20. And a cover cylinder portion 60b covering the outer peripheral surface of the end side.
The attachment portion 60a includes an engagement annular portion 60c that engages with an annular groove formed on the outer peripheral surface of the outer cover tube fitting portion 50d. The attachment portion 60a includes a not-shown cut portion formed so as to extend from the other end along the center line of the outer cover cylinder 60, and the inner diameter of the attachment portion 60a is expanded through the cut portion. By being formed in this way, the engagement annular portion 60c can be detachably engaged with the annular groove of the outer cover tube fitting portion 50d so that it can be attached. Installation is easy.
Thus, the other end side of the outer cover cylinder 60 is fixed to the other end side mounting portion 50, and the outer cover cylinder 60 is provided so as to cover the outer peripheral surface 40a of the inner tube 40. Scratch generation can be prevented.

即ち、第２クッションユニット１Ｂのアウタチューブ２０、一端側取付部３０、インナチューブ４０、他端側取付部５０、外側覆筒６０の外形と、第１クッションユニット１Ａのアウタチューブ２、一端側取付部３、インナチューブ４、他端側取付部５、外側覆筒６の外形とが同じ形状に形成されているため、外観上、２つの同じクッションユニットを備えた懸架装置に見え、外観上は従来と同じで、かつ、各クッションユニット１Ａ；１Ｂの部品点数を抑えることができてコストダウンが図れるとともに、大きなバネ反力を得ることができる懸架装置１を得ることができる。
尚、第１クッションユニット１Ａは、アウタチューブ２、インナチューブ４、外側覆筒６、摺動ガイド７、円環状ピストン８が、中心線を同じ２Ｃとする同軸状に配置されて構成されており、また、第２クッションユニット１Ｂは、アウタチューブ２０、インナチューブ４０、外側覆筒６０、摺動ガイド７０、ピストン８０が、中心線を同じ２０Ｃとする同軸状に配置されて構成されている。 That is, the outer tube 20 of the second cushion unit 1B, the one end side mounting portion 30, the inner tube 40, the other end side mounting portion 50, the outer shape of the outer cover cylinder 60, the outer tube 2 of the first cushion unit 1A, one end side mounting Since the outer shape of the portion 3, the inner tube 4, the other end side attachment portion 5, and the outer cover cylinder 6 is formed in the same shape, it looks like a suspension device having two identical cushion units on the appearance, The suspension device 1 can be obtained which is the same as the conventional one, can reduce the number of parts of each cushion unit 1A; 1B, can reduce the cost, and can obtain a large spring reaction force.
The first cushion unit 1A includes an outer tube 2, an inner tube 4, an outer cover cylinder 6, a sliding guide 7, and an annular piston 8 arranged coaxially with the same center line 2C. In addition, the second cushion unit 1B is configured such that the outer tube 20, the inner tube 40, the outer cover cylinder 60, the sliding guide 70, and the piston 80 are arranged coaxially with the same center line 20C.

図１に示すように、アウタチューブ２０は、他端近傍の内周面２０ｂ及び一端近傍の内周面２０ｃの径寸法が、他端近傍の内周面２０ｂと一端近傍の内周面２０ｃとの間の内周面２０ａの径寸法よりも大きい寸法に形成される。
そして、図１；図３に示すように、内周面２０ａと他端近傍の内周面２０ｂとの段差面は、アウタチューブ２０の中心線２０Ｃを中心とした円環平面２０ｄに形成される。
図３に示すように、摺動ガイド７０は、他端部の外周面の径がその他の部分の外周面の径よりも小径に形成された段付き円柱体の中央に段付き円柱体の中心線に沿って延長する貫通孔７０ｃが形成された構成である。即ち、摺動ガイド７０は、一端部が小外径部７０ａに形成され、その他の部分が大外径部７０ｂに形成された段付き円柱体の中心に貫通孔７０ｃを備えた構成である。 As shown in FIG. 1, the outer tube 20 has an inner circumferential surface 20b near the other end and an inner circumferential surface 20c near the other end, and the inner circumferential surface 20b near the other end and the inner circumferential surface 20c near the one end. It is formed in a dimension larger than the diameter dimension of the inner peripheral surface 20a.
As shown in FIG. 1; FIG. 3, the step surface between the inner peripheral surface 20a and the inner peripheral surface 20b in the vicinity of the other end is formed on an annular plane 20d with the center line 20C of the outer tube 20 as the center. .
As shown in FIG. 3, the sliding guide 70 has a center of the stepped cylinder at the center of the stepped cylinder in which the diameter of the outer peripheral surface of the other end is smaller than the diameter of the outer peripheral surface of the other part. In this structure, a through hole 70c extending along the line is formed. That is, the sliding guide 70 has a configuration in which a through hole 70c is provided at the center of a stepped cylinder having one end portion formed in the small outer diameter portion 70a and the other portion formed in the large outer diameter portion 70b.

摺動ガイド７０は、大外径部７０ｂの外周面とアウタチューブ２０の他端近傍の内周面２０ｂとが嵌まり合うように大外径部７０ｂがアウタチューブ２０の他端開口２３側の内側に嵌め込まれて大外径部７０ｂの一端面７０ｄがアウタチューブ２０の円環平面２０ｄに載置されて、かつ、大外径部７０ｂの他端面７０ｅよりも他端側にインナチューブ４０の外周面４０ａと摺動して当該外周面４０ａをシールするオイルシール等のシール部材７１が配置され、さらに、シール部材７１の他端側に円環状のシール部材抑え７２が配置された状態で、シール部材抑え７２よりも他端側に突出するアウタチューブ２０の他端開口縁部分２０ｔがシール部材抑え７２の他端面７２ｅに密着するように形成されたことで、アウタチューブ２０の他端近傍の内側に、アウタチューブ２０と同軸状（摺動ガイド７０の中心線とアウタチューブ２０の中心線２０Ｃとが一致した状態）に固定されている。 The sliding guide 70 has a large outer diameter portion 70b on the other end opening 23 side of the outer tube 20 so that the outer peripheral surface of the large outer diameter portion 70b and the inner peripheral surface 20b in the vicinity of the other end of the outer tube 20 are fitted together. One end surface 70d of the large outer diameter portion 70b is placed on the annular flat surface 20d of the outer tube 20, and the inner tube 40 is disposed on the other end side of the other end surface 70e of the large outer diameter portion 70b. In a state where a seal member 71 such as an oil seal that slides on the outer peripheral surface 40a and seals the outer peripheral surface 40a is disposed, and an annular seal member restrainer 72 is disposed on the other end side of the seal member 71, The other end opening edge portion 20t of the outer tube 20 that protrudes to the other end side of the seal member holding member 72 is formed so as to be in close contact with the other end surface 72e of the sealing member holding member 72, thereby the vicinity of the other end of the outer tube 20 Inside, it is fixed to the outer tube 20 coaxially (state in which the center line 20C matches the center line and the outer tube 20 of the sliding guide 70).

即ち、アウタチューブ２０は、第２クッションユニット１Ｂの伸縮時にインナチューブ４０の外周面４０ａが摺動する摺動ガイド７０及びインナチューブ４０の外周面４０ａの摺動時の液密を維持するシール部材７１を他端近傍の内側に備える。 That is, the outer tube 20 includes a sliding guide 70 on which the outer peripheral surface 40a of the inner tube 40 slides when the second cushion unit 1B is expanded and contracted, and a seal member that maintains liquid tightness when the outer peripheral surface 40a of the inner tube 40 slides. 71 is provided inside the vicinity of the other end.

図１に示すように、インナチューブ４０は、一端近傍の外周面４０ｂの径寸法が、一端近傍の外周面４０ｂと他端近傍の外周面４０ｃとの間の外周面４０ａの径寸法よりも小さい寸法に形成される。また、他端近傍の外周面４０ｃの径寸法は、外周面４０ａと同等径に形成され、他端近傍の外周面４０ｃには、他端側取付部５０のインナチューブ嵌合部５０ａの内周面に形成されたねじ部とねじ嵌合されるねじ部が形成されている。
そして、図３に示すように、外周面４０ａと一端近傍の外周面４０ｂとの段差面は、インナチューブ４０の中心線を中心とした円環平面４０ｄに形成される。 As shown in FIG. 1, in the inner tube 40, the diameter dimension of the outer peripheral surface 40b near one end is smaller than the diameter dimension of the outer peripheral surface 40a between the outer peripheral surface 40b near one end and the outer peripheral surface 40c near the other end. Formed into dimensions. Further, the outer peripheral surface 40c in the vicinity of the other end has the same diameter as that of the outer peripheral surface 40a, and the outer peripheral surface 40c in the vicinity of the other end has an inner periphery of the inner tube fitting portion 50a of the other end side mounting portion 50. A screw portion that is screw-fitted with a screw portion formed on the surface is formed.
As shown in FIG. 3, the step surface between the outer peripheral surface 40 a and the outer peripheral surface 40 b near one end is formed on an annular plane 40 d centering on the center line of the inner tube 40.

ピストン８０は、インナチューブ４０の一端近傍の外周面４０ｂを取り囲むように当該外周面４０ｂに取付けられてアウタチューブ２０の内周を摺動する円環状の外側ピストンと８０Ｂと、インナチューブ４０の一端近傍の内周面４０ｕに取付けられた円板状の内側ピストン８０Ａとを備える。 The piston 80 is attached to the outer peripheral surface 40 b so as to surround the outer peripheral surface 40 b in the vicinity of one end of the inner tube 40, and an annular outer piston 80 B that slides on the inner periphery of the outer tube 20, and one end of the inner tube 40. A disk-shaped inner piston 80A attached to the inner peripheral surface 40u in the vicinity.

内側ピストン８０Ａは、インナチューブ４０の内側とアウタチューブ２０の内側とを連通させる常時連通孔８７及び第１開閉孔８８が形成された円板状の流路構成部材８３と、当該第１開閉孔８８を開閉する第１開閉弁としてのチェックバルブ構成体９０とを備える。 The inner piston 80A includes a disk-shaped flow path component 83 formed with a continuous communication hole 87 and a first opening / closing hole 88 that allow the inner side of the inner tube 40 and the inner side of the outer tube 20 to communicate with each other, and the first opening / closing hole. And a check valve component 90 as a first on-off valve that opens and closes 88.

流路構成部材８３は、一端面にチェックバルブ機構８４を設置するための設置穴８５が形成されるとともに、外周面８３ａの径寸法がインナチューブ４０の内周面４０ｕの径寸法と対応した径寸法に形成された円板状部材の中央に、当該円板状部材の中心線に沿って他端面８３ｂと設置穴８５の底面８６とに貫通する貫通孔により形成された常時連通孔８７と、当該常時連通孔８７の周囲を取り囲むように当該常時連通孔８７と同軸の環状貫通孔により形成された第１開閉孔８８と、を備えた構成である。 The flow path component 83 is provided with an installation hole 85 for installing the check valve mechanism 84 on one end surface, and the diameter of the outer peripheral surface 83a corresponds to the diameter of the inner peripheral surface 40u of the inner tube 40. A continuous communication hole 87 formed by a through-hole penetrating the other end surface 83b and the bottom surface 86 of the installation hole 85 along the center line of the disk-shaped member at the center of the disk-shaped member formed in the dimension; The first open / close hole 88 is formed by an annular through hole coaxial with the always communicating hole 87 so as to surround the periphery of the always communicating hole 87.

流路構成部材８３は、インナチューブ４０の一端近傍の内周面４０ｕに嵌め込まれた状態でインナチューブ４０の一端近傍の外周面４０ｂを加締めることにより、インナチューブ４０の一端近傍の内周面４０ｕに固定されている。 The flow path component 83 is crimped to the outer peripheral surface 40b in the vicinity of one end of the inner tube 40 while being fitted into the inner peripheral surface 40u in the vicinity of one end of the inner tube 40, whereby the inner peripheral surface in the vicinity of one end of the inner tube 40 It is fixed to 40u.

チェックバルブ機構８４は、設置穴８５に設置されたチェックバルブ構成体９０と、チェックバルブ構成体９０が設置穴８５から脱落しないように所定の状態に維持する円環状のチェックバルブ抑え部材９１とを備える。 The check valve mechanism 84 includes a check valve structure 90 installed in the installation hole 85 and an annular check valve restraining member 91 that maintains the check valve structure 90 in a predetermined state so that the check valve structure 90 does not fall out of the installation hole 85. Prepare.

チェックバルブ構成体９０は、円環状薄板等により形成されたチェックバルブ９０Ａとバルブスプリング９０Ｂとが組み合わされて構成される。即ち、チェックバルブ９０Ａの一端側にバルブスプリング９０Ｂが設けられる。
チェックバルブ９０Ａはオイルの連通路となる貫通孔９０ａを中央に備え、バルブスプリング９０Ｂは中央側がオイルの連通路となる連通孔９０ｂとなっている。チェックバルブ９０Ａの貫通孔９０ａの径寸法は、常時連通孔８７の径寸法よりも大きく、かつ、開閉孔８８の内周面の径寸法よりも小さい寸法に形成される。バルブスプリング９０Ｂの連通孔９０ｂの径寸法は、チェックバルブ９０Ａの貫通孔９０ａの径寸法よりも大きい寸法に形成される。
チェックバルブ構成体９０は、チェックバルブ９０Ａ側を設置穴８５の穴底に向けて設置された後、設置穴８５の内周面に形成された円環状の固定溝９２にチェックバルブ抑え部材９１の円環状の外周縁部を嵌め込むようにしてチェックバルブ抑え部材９１を設置穴８５内に固定することで、チェックバルブ９０Ａの貫通孔９０ａ及びバルブスプリング９０Ｂの連通孔９０ｂの中心線と常時連通孔８７の中心線とが一致するように設置穴８５に取付けられる。 The check valve structure 90 is configured by combining a check valve 90A and a valve spring 90B formed of an annular thin plate or the like. That is, the valve spring 90B is provided on one end side of the check valve 90A.
The check valve 90A has a through hole 90a at the center serving as an oil communication path, and the valve spring 90B has a communication hole 90b at the center side serving as an oil communication path. The diameter dimension of the through hole 90 a of the check valve 90 A is always larger than the diameter dimension of the communication hole 87 and smaller than the diameter dimension of the inner peripheral surface of the opening / closing hole 88. The diameter of the communication hole 90b of the valve spring 90B is formed to be larger than the diameter of the through hole 90a of the check valve 90A.
After the check valve component 90 is installed with the check valve 90 A side facing the bottom of the installation hole 85, the check valve holding member 91 is inserted into the annular fixing groove 92 formed on the inner peripheral surface of the installation hole 85. By fixing the check valve restraining member 91 in the installation hole 85 so as to fit the annular outer peripheral edge portion, the center line of the through hole 90a of the check valve 90A and the communication hole 90b of the valve spring 90B and the continuous communication hole 87 are always provided. It is attached to the installation hole 85 so that the center line matches.

チェックバルブ構成体９０は、第２クッションユニット１Ｂの圧縮動作時にはチェックバルブ９０Ａが第１開閉孔８８の一端開口を塞ぐように動作し（図３参照）、第２クッションユニット１Ｂの伸長動作時にはチェックバルブ９０Ａが第１開閉孔８８の一端開口を開くように動作する（図４参照）。 The check valve component 90 operates so that the check valve 90A closes one end opening of the first opening / closing hole 88 when the second cushion unit 1B is compressed (see FIG. 3), and is checked when the second cushion unit 1B is extended. The valve 90A operates to open one end opening of the first opening / closing hole 88 (see FIG. 4).

第２クッションユニット１Ｂは、外側ピストン８０Ｂと摺動ガイド７０とインナチューブ４０の外周面４０ａとアウタチューブ２０の内周面２０ａとで囲まれた液体流動空間８９を備える。 The second cushion unit 1B includes a liquid flow space 89 surrounded by the outer piston 80B, the sliding guide 70, the outer peripheral surface 40a of the inner tube 40, and the inner peripheral surface 20a of the outer tube 20.

インナチューブ４０の一端近傍には、液体流動空間８９とインナチューブ４０の内側とに連通する連通孔４４が形成されている。 Near one end of the inner tube 40, a communication hole 44 that communicates with the liquid flow space 89 and the inside of the inner tube 40 is formed.

外側ピストン８０Ｂは、アウタチューブ２０の内側と液体流動空間８９とを連通させる第２開閉孔９８が形成された円環状の流路形成部材８０Ｃと、当該第２開閉孔９８を開閉する第２開閉弁としてのチェックバルブ９９を備える。
第２開閉孔９８は、例えば、円環状の流路形成部材８０Ｃの外周面８０ｄに形成された円環状溝９５により形成された中継路に繋がる一端側流路９３と他端側流路９４とで構成される。当該第２開閉孔９８は流路形成部材８０Ｃの外周面の周方向に沿って例えば等間隔で複数個形成されている。
チェックバルブ９９は、円環状溝９５に収容される円環状溝９５の大きさよりも若干小さい寸法の円環状部材としてのピストンリングにより形成される。 The outer piston 80 B includes an annular flow path forming member 80 C in which a second opening / closing hole 98 that connects the inside of the outer tube 20 and the liquid flow space 89 is formed, and a second opening / closing that opens and closes the second opening / closing hole 98. A check valve 99 is provided as a valve.
The second opening / closing hole 98 includes, for example, one end-side passage 93 and the other end-side passage 94 that are connected to the relay passage formed by the annular groove 95 formed in the outer peripheral surface 80d of the annular passage-forming member 80C. Consists of. A plurality of the second opening / closing holes 98 are formed, for example, at equal intervals along the circumferential direction of the outer peripheral surface of the flow path forming member 80C.
The check valve 99 is formed by a piston ring as an annular member having a size slightly smaller than the size of the annular groove 95 accommodated in the annular groove 95.

第２クッションユニット１Ｂの圧縮動作時には、チェックバルブ９９が一端側流路９３の出口周りの壁面９６から離れて一端側流路９３の出口を開いて一端側流路９３と他端側流路９４とを中継路としての円環状溝９５を介して連通させることにより第２開閉孔９８を開くように動作し（図３参照）、第２クッションユニット１Ｂの伸長動作時にはチェックバルブ９９が一端側流路９３の出口周りの壁面９６に接触して一端側流路９３の出口を塞ぐことにより当該第２開閉孔９８を閉じるように動作する（図４参照）。 During the compression operation of the second cushion unit 1B, the check valve 99 is separated from the wall surface 96 around the outlet of the one end side passage 93 to open the outlet of the one end side passage 93, and the one end side passage 93 and the other end side passage 94 are opened. Are connected to each other via an annular groove 95 as a relay path to open the second opening / closing hole 98 (see FIG. 3). When the second cushion unit 1B is extended, the check valve 99 is connected to the one end side flow. The second opening / closing hole 98 is closed by contacting the wall surface 96 around the outlet of the passage 93 and closing the outlet of the one end side passage 93 (see FIG. 4).

流路形成部材８０Ｃは、円柱体の中央に円柱体の中心線に沿って延長する貫通孔８０ｃが形成された構成であり、貫通孔８０ｃの内周面の径寸法がインナチューブ４０の一端近傍の外周面４０ｂに嵌まり込む寸法に形成され、外周面８０ｄの径寸法がアウタチューブ２の内周面２０ａの径寸法に対応した寸法に形成されている。 The flow path forming member 80C has a configuration in which a through hole 80c extending along the center line of the cylindrical body is formed at the center of the cylindrical body, and the diameter of the inner peripheral surface of the through hole 80c is near one end of the inner tube 40. The outer peripheral surface 80d has a size that fits into the outer peripheral surface 40b, and the outer peripheral surface 80d has a diameter corresponding to the diameter of the inner peripheral surface 20a of the outer tube 2.

そして、流路形成部材８０Ｃは、貫通孔８０ｃの内周面がインナチューブ４０の一端近傍の外周面４０ｂに嵌め込まれて他端面８０ｅがインナチューブ４０の円環平面４０ｄに載置された状態で、一端面８０ｆよりも一端側に突出するインナチューブ４０の一端端開口縁部分４０ｔが一端面８０ｆに密着するように形成されたことで、インナチューブ４０の一端近傍の内側に、インナチューブ４０と同軸状（外側ピストン８０Ｂの中心線とインナチューブ４０の中心線とが一致した状態）に固定されている。
この場合、インナチューブ４０の外周面４０ｂの一端開口縁部分４０ｔ側と流路形成部材８０Ｃの貫通孔８０ｃの内周面とが密着し、かつ、インナチューブ４０の一端開口縁部分４０ｔが流路形成部材８０Ｃの内周面８０ｃと一端面８０ｆとの境界縁部で折曲されて折曲された一端開口縁部分４０ｔと流路形成部材８０Ｃの一端面８０ｆとが密着するように、例えばローリング加締め機でローリング加締め加工されることによって、インナチューブ４０の一端近傍の内側に流路形成部材８０Ｃが固定される。 The flow path forming member 80C is in a state where the inner peripheral surface of the through hole 80c is fitted into the outer peripheral surface 40b near one end of the inner tube 40 and the other end surface 80e is placed on the annular plane 40d of the inner tube 40. The inner tube 40 and the inner tube 40 are formed so that the one end surface opening edge portion 40t of the inner tube 40 protruding toward the one end side from the one end surface 80f is in close contact with the one end surface 80f. It is fixed coaxially (a state in which the center line of the outer piston 80B and the center line of the inner tube 40 coincide).
In this case, the one end opening edge portion 40t side of the outer peripheral surface 40b of the inner tube 40 is in close contact with the inner peripheral surface of the through hole 80c of the flow path forming member 80C, and the one end opening edge portion 40t of the inner tube 40 is the flow path. For example, rolling is performed so that the one end opening edge portion 40t bent at the boundary edge between the inner peripheral surface 80c and the one end surface 80f of the forming member 80C and the one end surface 80f of the flow path forming member 80C are in close contact with each other. The flow path forming member 80 C is fixed inside the vicinity of one end of the inner tube 40 by rolling and caulking with a caulking machine.

即ち、減衰力発生機構は、液体流動空間８９と、インナチューブ４０の一端側に形成された連通孔４４と、常時連通孔８７及び第１開閉孔８８と、第１開閉弁としてのチェックバルブ９０Ａと、第２開閉孔９８と、第２開閉弁としてのチェックバルブ９９とを備えて構成される。 That is, the damping force generating mechanism includes the liquid flow space 89, the communication hole 44 formed on one end side of the inner tube 40, the constant communication hole 87 and the first opening / closing hole 88, and the check valve 90A as the first opening / closing valve. And a second opening / closing hole 98 and a check valve 99 as a second opening / closing valve.

減衰力発生機構による減衰力発生動作を図３；図４を参照して説明する。
インナチューブ４の一端と一端側取付部３０とが互いに近づく方向に移動して液体流動空間８９が拡大する圧縮動作時においては、図３に示すように、第１開閉弁としてのチェックバルブ９０Ａが第１開閉孔８８を閉じるように動作してアウタチューブ２０の内側のオイルが常時連通孔８７を介してインナチューブ４０の内側に矢印Ａ１のように流入する際の流路抵抗によって減衰力を発生させ、かつ、インナチューブ４０の内側のオイルが液体流動空間８９内に矢印Ａ２のように流入するとともに、第２開閉弁としてのチェックバルブ９９が第２開閉孔９８を開くように動作してアウタチューブ２０の内側のオイルが当該第２開閉孔９８を介して液体流動空間８９内に矢印Ａ３のように流入する。即ち、圧縮動作時においては、オイルが常時連通孔８７を通過する際の流路抵抗によって減衰力が発生する。 A damping force generation operation by the damping force generation mechanism will be described with reference to FIG. 3 and FIG.
As shown in FIG. 3, the check valve 90 A serving as the first on-off valve is provided at the time of the compression operation in which one end of the inner tube 4 and the one end-side attachment portion 30 move toward each other and the liquid flow space 89 expands. By operating to close the first opening / closing hole 88, a damping force is generated by the flow path resistance when the oil inside the outer tube 20 always flows into the inner tube 40 through the communication hole 87 as shown by the arrow A1. In addition, the oil inside the inner tube 40 flows into the liquid flow space 89 as indicated by the arrow A2, and the check valve 99 as the second on-off valve operates so as to open the second on-off hole 98. The oil inside the tube 20 flows into the liquid flow space 89 through the second opening / closing hole 98 as shown by an arrow A3. That is, during the compression operation, a damping force is generated by the flow path resistance when oil always passes through the communication hole 87.

またインナチューブ４の一端と一端側取付部３０とが互いに離れる方向に移動して液体流動空間８９が縮小する伸長動作時においては、図４に示すように、チェックバルブ９９が第２開閉孔９８を閉じるように動作して液体流動空間８９内のオイルが矢印Ｂ１のように流通孔４４を介してインナチューブ４０の内側に流入する際の流路抵抗によって減衰力を発生させ、かつ、インナチューブ４０内のオイルが第１開閉孔８７を塞いでいるチェックバルブ９０Ａを押圧することによりチェックバルブ９０Ａがチェックバルブ抑え部材９１に近付く方向に押圧されて第１開閉孔８８を開くので、インナチューブ４０内のオイルが、矢印Ｂ２のように常時連通孔８７及び第１開閉孔８８を通過してアウタチューブ２０内に流入する、即ち、伸長動作時においては、オイルが液体流動空間８９内から流通孔４４を介してインナチューブ４０内に流入する際の流路抵抗により減衰力が発生する。 Further, at the time of the extension operation in which the one end of the inner tube 4 and the one end side attachment portion 30 move away from each other and the liquid flow space 89 is contracted, the check valve 99 has the second opening / closing hole 98 as shown in FIG. And a damping force is generated by the flow path resistance when the oil in the liquid flow space 89 flows into the inner tube 40 through the circulation hole 44 as indicated by an arrow B1, and the inner tube Since the oil in 40 presses the check valve 90A blocking the first opening / closing hole 87, the check valve 90A is pressed in the direction approaching the check valve holding member 91 to open the first opening / closing hole 88. The oil in the tank always flows through the communication hole 87 and the first opening / closing hole 88 and flows into the outer tube 20 as indicated by an arrow B2, that is, an extension operation. In the damping force is generated by the flow path resistance when the oil flows into the inner tube 40 from the liquid flow space within 89 via the communication holes 44.

図１に示すように、第１クッションユニット１Ａの他端側取付部５の取付孔５ｂが図外の自動二輪車の車体フレームの取付軸５５に取付けられ、かつ、一端側取付部３の取付孔３ｂが図外の自動二輪車の車輪の取付軸３５に取付けられるとともに、第２クッションユニット１Ｂの他端側取付部５０の取付孔５０ｂが図外の自動二輪車の車体フレームの取付軸５５に取付けられ、かつ、一端側取付部３０の取付孔３０ｂが図外の自動二輪車の車輪の取付軸３５に取付けられることによって、自動二輪車のリアクッションを構成する懸架装置１となる。 As shown in FIG. 1, the attachment hole 5b of the other end side attachment portion 5 of the first cushion unit 1A is attached to the attachment shaft 55 of the body frame of the motorcycle not shown, and the attachment hole of the one end side attachment portion 3 is attached. 3b is attached to a mounting shaft 35 of a motorcycle wheel (not shown), and a mounting hole 50b of the other end mounting portion 50 of the second cushion unit 1B is attached to a mounting shaft 55 of a motorcycle body frame (not shown). Moreover, the suspension device 1 constituting the rear cushion of the motorcycle is obtained by attaching the attachment hole 30b of the one end side attachment portion 30 to the attachment shaft 35 of the motorcycle wheel (not shown).

実施形態の懸架装置１によれば、各クッションユニット１Ａ；１Ｂの部品点数を抑えることができてコストダウンを図れるとともに、第１クッションユニット１Ａの固定バネによる反力と第２クッションユニット１Ｂの空気ばねによる反力とによる大きなバネ反力を得ることができる。 According to the suspension device 1 of the embodiment, the number of parts of each cushion unit 1A; 1B can be suppressed, the cost can be reduced, the reaction force by the fixing spring of the first cushion unit 1A and the air of the second cushion unit 1B. A large spring reaction force due to the reaction force by the spring can be obtained.

また、従来、自動二輪車用のリアクッションにおいては、ピストンはロッドの端部に設けられており、ロッドとしては小径のものを用いていたため、ロッドの曲がり変形に対する耐性が低いという問題があった。
実施形態では、円筒形状、即ち、パイプにより形成されたインナチューブ４；４０の端部にピストンを設けるようにしたことで、インナチューブ４；４０の曲げ強度を向上させた構造とした。 Conventionally, in a rear cushion for a motorcycle, the piston is provided at the end of the rod, and since the rod has a small diameter, there is a problem that the resistance to bending deformation of the rod is low.
In the embodiment, a cylindrical shape, that is, a structure in which the bending strength of the inner tube 4; 40 is improved by providing a piston at the end of the inner tube 4; 40 formed by a pipe.

尚、本発明の懸架装置１は、自動二輪車以外の車両の懸架装置としても使用可能である。 The suspension device 1 of the present invention can also be used as a suspension device for vehicles other than motorcycles.

１懸架装置、１Ａ第１クッションユニット、１Ｂ第２クッションユニット、
２；２０アウタチューブ、２ｈ一端着座部、３；３０一端側取付部、
４；４０インナチューブ、５；５０他端側取付部、６；６０外側覆筒、
７；７０摺動ガイド、７ａ小外径部（接触防止部）、８円環状ピストン、
９内側スプリング、１０外側スプリング、４４連通孔、
７１シール部材（液体シール部材）、８０ピストン、８０Ａ内側ピストン、
８０Ｂ外側ピストン、８７常時連通孔、８８第１開閉孔、８９液体流動空間、
９０Ａチェックバルブ（第１開閉弁）、９８第２開閉孔、
９９チェックバルブ（第２開閉弁）。 1 suspension device, 1A first cushion unit, 1B second cushion unit,
2; 20 outer tube, 2h one end seating part, 3; 30 one end side attachment part,
4; 40 inner tube, 5; 50 other end side mounting portion, 6; 60 outer cover tube,
7; 70 sliding guide, 7a small outer diameter part (contact prevention part), 8 annular piston,
9 Inner spring, 10 Outer spring, 44 Communication hole,
71 Seal member (liquid seal member), 80 piston, 80A inner piston,
80B outer piston, 87 always communicating hole, 88 first opening / closing hole, 89 liquid flow space,
90A check valve (first on-off valve), 98 second on-off hole,
99 Check valve (second on-off valve).

Claims

A suspension device comprising a pair of a first cushion unit and a second cushion unit for suspending a vehicle,
The first cushion unit has a spring that cushions vibration by its reaction force,
The second cushion unit has a damping force generation mechanism that has a gas and a liquid filled therein and generates a damping force by the circulation of the liquid,
A suspension device characterized in that the vehicle is suspended by the reaction force of the spring in the first cushion unit being compensated by the reaction force generated by compressing the gas in the second cushion unit.

The second cushion unit is
A cylindrical outer tube having one end sealed and the other open;
An inner tube having the other end side sealed and one end side inserted into the outer tube through the other end opening of the outer tube;
A piston provided near one end of the inner tube and slidably provided on the inner periphery of the outer tube;
2. The second cushion unit is expanded and contracted by relative movement between the inner tube and the outer tube, and gas is compressed by the expansion and contraction of the second cushion unit to generate a gas reaction force. The suspension described.

The piston is attached to the outer peripheral surface so as to surround the outer peripheral surface in the vicinity of one end of the inner tube and slides on the inner periphery of the outer tube, and the inner periphery in the vicinity of one end of the inner tube. A disc-shaped inner piston attached to the surface,
The outer tube includes a sliding guide and a liquid seal member on the inner side near the other end, on which an outer peripheral surface of the inner tube slides when the second cushion unit expands and contracts.
The damping force generation mechanism is
A liquid flow space surrounded by the outer piston, the sliding guide, the outer peripheral surface of the inner tube, and the inner peripheral surface of the outer tube;
A communication hole formed on one end side of the inner tube and communicating with the liquid flow space and the inner side of the inner tube;
A first communication hole and a first opening / closing hole which are formed in the inner piston and communicate with the inner side of the inner tube and the inner side of the outer tube, and a first opening / closing which is provided in the inner piston and opens and closes the first opening / closing hole. A valve,
A second opening / closing hole formed in the outer piston for communicating the inside of the outer tube and the liquid flow space; and a second opening / closing valve provided in the outer piston for opening / closing the second opening / closing hole;
During the compression operation in which the liquid flow space expands, the first opening / closing valve operates to close the first opening / closing hole so that the liquid inside the outer tube passes through the continuous communication hole. A damping force is generated by the flow path resistance when flowing inward, the liquid inside the inner tube flows into the liquid flow space, and the second opening / closing valve opens the second opening / closing hole. And the liquid inside the outer tube flows into the liquid flow space through the second opening / closing hole,
During the expansion operation in which the liquid flow space is contracted, the second open / close valve operates to close the second open / close hole so that the liquid flowing in the liquid flow space flows into the inner tube. A damping force is generated by a path resistance, and the first opening / closing valve operates to open the first opening / closing hole, so that the liquid inside the inner tube passes through the first opening / closing hole and the constant communication hole. The suspension device according to claim 2, wherein the suspension device is configured to flow into the outer tube.

The first cushion unit includes:
A cylindrical outer tube whose one end is fixed and sealed to the one end mounting portion and whose other end is opened;
The other end side is fixed to the other end side mounting portion and sealed, and one end side is inserted into the outer tube through the other end opening of the outer tube;
A piston provided near one end of the inner tube and slidably provided on the inner periphery of the outer tube;
One end seated on one end seating portion of the one end side mounting portion and the other end seated on the inner side of the outer tube and the inner tube, and the other end seated on the other end side mounting portion. An inner spring provided to seat on the
An outer spring provided so that one end is seated on one end seating portion formed on the other end side of the outer tube and the other end is seated on a second other end seating portion of the other end side mounting portion;
The suspension device according to claim 1, wherein a reaction force of the inner spring and the outer spring is generated during a compression operation in which the inner spring and the outer spring are compressed.

The one end seating portion on the other end side of the outer tube is interposed between the inner peripheral surface on one end side of the outer spring and the outer peripheral surface of the inner tube, and the inner peripheral surface on one end side of the outer spring and the inner The suspension device according to claim 4, further comprising a contact prevention unit that prevents contact with an outer peripheral surface of the tube.

The outer cover cylinder for covering the outer peripheral surface of the said inner tube and the said outer spring is provided, The other end part of the said outer cover cylinder is attached to the said other end side attachment part so that attachment or detachment is possible. Alternatively, the suspension device according to claim 5.

The suspension device according to any one of claims 1 to 6, wherein the outer shape of the first cushion unit and the outer shape of the second cushion unit are formed in the same shape.