WO2009122513A1 - ダストブーツ - Google Patents
ダストブーツ Download PDFInfo
- Publication number
- WO2009122513A1 WO2009122513A1 PCT/JP2008/056376 JP2008056376W WO2009122513A1 WO 2009122513 A1 WO2009122513 A1 WO 2009122513A1 JP 2008056376 W JP2008056376 W JP 2008056376W WO 2009122513 A1 WO2009122513 A1 WO 2009122513A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- sliding contact
- damper
- peripheral surface
- piston rod
- rod
- Prior art date
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/38—Covers for protection or appearance
Definitions
- the present invention relates to a dust boot for preventing dust from adhering to a piston rod.
- Some dampers have a dust boot that covers the protrusion of the piston rod from the cylinder in order to prevent dust from adhering to the piston rod.
- Patent Document 1 discloses a dust boot having a duster whose tip is in sliding contact with the outer peripheral surface of a piston rod. JP 2007-71246 A
- grease is applied to the sliding surface of the dust lip with the piston rod in order to ensure stable sliding with the piston rod.
- the present invention has been made in view of the above-described problems, and an object thereof is to provide a dust boot that can stably slide with a piston rod for a long period of time.
- the present invention provides a sliding contact surface, which is provided in a damper into which a piston rod is inserted into a cylinder so as to be able to advance and retreat, and is in sliding contact with an outer peripheral surface of the piston rod in a dust boot that covers a protruding portion of the piston rod from the cylinder.
- a holding portion for holding a lubricant is formed on the sliding contact surface, and the lip portion has a different sliding contact surface in each of the extension stroke and the contraction stroke of the damper. It is characterized by being in sliding contact with the outer peripheral surface of the piston rod.
- the lip portion of the dust boot has a plurality of sliding contact surfaces on which holding portions for holding the lubricant are formed, and different sliding contact surfaces are provided in each of the extension stroke and the compression stroke of the damper. Since the piston rod is in sliding contact with the outer peripheral surface, the holding portion holds the lubricant for a long time. Therefore, stable sliding with the piston rod is possible for a long time.
- the damper 1 generates a damping force by expanding and contracting, and in the present embodiment, the damper 1 is interposed horizontally between the vehicle bodies so as to attenuate relative shaking between the vehicle bodies of the railway vehicle.
- the damper 1 includes an outer tube 2, an inner tube 3 coaxially accommodated in the outer tube 2, a piston 4 that moves slidably along the inner periphery of the inner tube 3, and a piston 4 coupled to one end.
- the other end is provided with a rod 5 as a piston rod that protrudes outward from the outer tube 2 in the axial direction.
- the damper 1 of the present embodiment is a double tube type damper.
- two oil chambers (fluid chambers) 6 and 7 are defined by the piston 4.
- the oil chamber 6 on the rod 5 side communicates with a reservoir chamber 9 formed between the inner tube 3 and the outer tube 2 through a check valve 8.
- the check valve 8 allows only the flow of working oil (working fluid) from the reservoir chamber 9 to the oil chamber 6.
- the oil chamber 7 on the side opposite to the rod communicates with the reservoir chamber 9 via the pressure side damping valve 10.
- the piston 4 is also provided with an expansion side damping valve and a pressure side damping valve.
- the outer tube 2 and the inner tube 3 constitute the cylinder 11, and hydraulic oil is sealed in the cylinder 11.
- the outer tube 2 is a bottomed cylindrical member, and the outer periphery is supported by a stepped portion 2a formed on the inner periphery of the outer tube 2 inside the opening from which the rod 5 protrudes, and the shaft core is inserted.
- a rod guide 20 is provided for slidably supporting the rod 5 to be slid.
- the rod guide 20 is formed with a hole 20a having a circular opening, and the end of the inner tube 3 is inserted into the inner peripheral surface of the hole 20a. As described above, the rod guide 20 closes the opening on the rod 5 side of the outer tube 2 and the inner tube 3 to partition the oil chamber 6 and the reservoir chamber 9.
- a small diameter portion 20 b is formed on the back surface of the rod guide 20 that does not face the oil chamber 6 and the reservoir chamber 9.
- a seal member 21 for sealing between the outer peripheral surface of the rod 5 and the inner peripheral surface of the rod guide 20 is disposed on the inner periphery of the small diameter portion 20b. The seal member 21 prevents leakage of hydraulic oil to the outside.
- a cap member 22 whose outer periphery is screwed into the inner periphery of the outer tube 2 is assembled inside the opening end of the outer tube 2.
- the cap member 22 prevents the rod guide 20 from coming off from the outer tube 2.
- the rod 5 is slidably inserted through the axis of the cap member 22.
- the cap member 22 is formed with a fitting hole 22a into which the small diameter portion 20b of the rod guide 20 is fitted, and the rod guide 20 and the cap member 22 are integrally formed by fitting the small diameter portion 20b and the fitting hole 22a. Become.
- the rod guide 20 and the cap member 22 constitute a closing member that closes the opening of the cylinder 11 on the rod 5 side.
- the rod guide 20 and the cap member 22 may be configured as an integral member.
- the dust boot 30 which covers the protrusion part 5a is attached to the cap member 22 for the purpose of preventing adhesion of dust from the outer tube 2 of the rod 5 to the protrusion part 5a.
- An attachment ring 13 for attaching the damper 1 to the vehicle body is fixed to the bottom of the outer tube 2.
- An attachment ring 14 for attaching the damper 1 to the vehicle body is also fixed to the protruding end of the rod 5.
- the damper 1 is interposed between the vehicle bodies via the attachment rings 13 and 14 provided at both ends.
- the cover 12 which covers the protrusion part 5a from the outer tube 2 of the rod 5 is fixed to the mounting ring 14.
- the cover 12 has an inner diameter slightly larger than the outer diameter of the outer tube 2 and overlaps a part of the outer periphery of the outer tube 2 as shown in the figure.
- the damper 1 is interposed between the vehicle bodies via attachment rings 13 and 14 provided at both ends, and the rod 5 is inserted in the cylinder 11 so as to be able to advance and retract. It can be expanded and contracted. Along with the expansion and contraction operation, the hydraulic oil passes through each damping valve, and a damping force is generated by the fluid resistance generated during the passage.
- the dust boot 30 is a substantially conical cylindrical bellows-like member and is made of an elastic resin.
- the dust boot 30 is formed to have a length that covers a part of the protruding portion 5 a of the rod 5, specifically, a length that is greater than the normal amplitude of the rod 5.
- a lip portion 31 having an inner diameter substantially the same as the outer diameter of the rod 5 and slidably in contact with the outer peripheral surface of the rod 5 is formed at the tip portion on the small diameter side of the dust boot 30.
- the lip portion 31 slides along the outer peripheral surface of the rod 5 as the rod 5 moves forward and backward, and prevents dust from entering the dust boot 30.
- An annular ring portion 32 is formed at the proximal end portion of the dust boot 30 on the large diameter side.
- the dust boot 30 is fixed to the cap member 22 via the ring portion 32.
- a groove 24 that is recessed in a concave shape is formed on the end surface 22 b of the cap member 22.
- the groove portion 24 is formed as an annular groove having the rod 5 as a central axis, and the depth thereof is substantially the same as the axial dimension of the ring portion 32 of the dust boot 30.
- the dust boot 30 is attached to the cap member 22 by the ring portion 32 being inserted into the inner peripheral surface of the groove portion 24 and being fixed.
- FIGS. 2 is a cross-sectional view of the lip portion 31 in the neutral state of the damper 1
- FIG. 3 is a cross-sectional view of the lip portion 31 in the expansion stroke of the damper 1
- FIG. 4 is a cross-sectional view of the lip portion 31 in the contraction stroke of the damper 1.
- FIG. The arrows in FIGS. 3 and 4 indicate the moving direction of the rod 5.
- the lip portion 31 is a ring member having a substantially rectangular cross-sectional shape including the central axis of the rod 5.
- the lip portion 31 is substantially parallel to the inner peripheral surface 35 a parallel to the outer peripheral surface of the rod 5 and the inner peripheral surface 35 a. It consists of four surfaces, ie, both end surfaces 35b and 35c which are perpendicular to the outer peripheral surface of the rod 5, and an outer peripheral surface 35d to which the main body 33 of the dust boot 30 is coupled.
- a deformation portion 34 that is elastically deformed according to the moving direction of the rod 5 is formed.
- the deformable portion 34 When the damper 1 extends from the neutral state, the deformable portion 34 is elastically deformed by the static frictional force between the outer peripheral surface of the rod 5 and the inner peripheral surface 35a, and the lip portion 31 rotates clockwise with the deformable portion 34 as a fulcrum. Rotate to. Thereby, as shown in FIG. 3, the surface in sliding contact with the rod 5 in the lip portion 31 changes from the inner peripheral surface 35a to one end surface 35b.
- the deformable portion 34 When the damper 1 contracts from the neutral state, the deformable portion 34 is elastically deformed by the static frictional force between the outer peripheral surface of the rod 5 and the inner peripheral surface 35a, and the lip portion 31 counterclockwise with the deformable portion 34 as a fulcrum. Rotate around. Thereby, as shown in FIG. 4, the surface in sliding contact with the rod 5 in the lip portion 31 changes from the inner peripheral surface 35a to the other end surface 35c.
- the deforming portion 34 is elastically deformed in different directions in the extension stroke and the contraction stroke of the damper 1.
- the lip portion 31 rotates counterclockwise, and the surface of the lip portion 31 that is in sliding contact with the rod 5 moves from the one end surface 35b to the inner peripheral surface 35a. Then, it changes to the other end face 35c.
- the lip portion 31 is a sliding contact surface that is in sliding contact with the outer peripheral surface of the rod 5, and the inner peripheral surface 35 a (first sliding contact surface) that is in sliding contact with the outer peripheral surface of the rod 5 in the neutral state of the damper 1.
- the lip portion 31 is in sliding contact with the outer peripheral surface of the rod 5 in the expansion stroke and the contraction stroke of the damper 1 due to the elastic deformation of the deformation portion 34.
- deforming portion 34 it is desirable to form the deforming portion 34 smaller than the thickness of other portions so that it is easily elastically deformed.
- sliding contact surface 35 The inner circumferential surface 35a and both end surfaces 35b, 35c (hereinafter referred to as “sliding contact surface 35”) are formed with a recessed groove groove (holding portion) 36 for holding grease (lubricant).
- the grease groove 36 is formed in an annular shape over the entire circumference of the sliding contact surface 35.
- the lip portion 31 is formed with a plurality of grease grooves 36.
- the lip portion 31 slides smoothly on the outer peripheral surface of the rod 5.
- the grease prevents dust from entering the dust boot 30 from between the outer peripheral surface of the rod 5 and the sliding contact surface 35.
- the lip portion 31 of the dust boot 30 has a plurality of sliding contact surfaces 35 in which grease grooves 36 for holding grease are formed, and different sliding contact surfaces 35 are rods in each of the extension stroke and the contraction stroke of the damper 1. 5 is in sliding contact with the outer peripheral surface of the grease 5, so that the grease is retained in the grease groove 36 for a long time even when sliding with the rod 5 is repeated.
- the lip portion 31 can stably slide with the rod 5 for a long period of time, the durability of the lip portion 31 can be improved and the intrusion of dust into the dust boot 30 can be prevented for a long period of time. .
- the damage of the sealing member 21 due to the intrusion of dust is also prevented, the high-quality damper 1 that hardly leaks oil can be obtained.
- the damper 1 can be smoothly started without applying the static friction force, which is a friction force larger than the dynamic friction force, to the rod 5. It becomes possible.
- the lip portion 31 has been described as having three sliding contact surfaces 35.
- the lip portion 31 may have a polygonal cross-sectional shape and four or more sliding contact surfaces 35 may be provided. .
- the shape of the lip portion 31 is not limited to the shape in which the end surfaces 35b and 35c are substantially perpendicular to the inner peripheral surface 35a as in the above-described embodiment, and the end surfaces 35b and 35c are the same as the inner peripheral surface 35a as shown in FIG. It is good also as a shape which makes an obtuse angle.
- the rotation angle of the lip portion 31 is 90 degrees or less, so that the swing angle of the deformable portion 34 can be small, and the durability of the deformable portion 34 is improved.
- the horizontal damper that is horizontally interposed between the vehicle bodies of the railway vehicle has been described.
- the present invention is a damper that is interposed between other devices, for example, a vehicle body and an axle. It can also be applied to.
- the damper 1 has been described as a double tube type, but the present invention can also be applied to a single tube type damper.
- the damper according to the present invention can be applied to a horizontal damper that is horizontally interposed between the vehicle bodies so as to attenuate relative fluctuations between the vehicle bodies of the railway vehicle.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Fluid-Damping Devices (AREA)
- Sealing Devices (AREA)
- Diaphragms And Bellows (AREA)
Abstract
Description
2 アウタチューブ
3 インナチューブ
4 ピストン
5 ロッド
5a 突出部
6,7 油室
11 シリンダ
21 シール部材
22 キャップ部材
30 ダストブーツ
31 リップ部
33 本体部
34 変形部
35 摺接面
35a 内周面
35b,35c 端面
36 グリース溝
Claims (5)
- シリンダに対してピストンロッドが進退自在に挿入されるダンパに設けられ、前記ピストンロッドの前記シリンダからの突出部を覆うダストブーツにおいて、
前記ピストンロッドの外周面に摺接する摺接面を複数有するリップ部を備え、
前記摺接面には潤滑剤を保持するための保持部が形成され、
前記リップ部は、前記ダンパの伸長行程及び収縮行程のそれぞれで、異なる摺接面が前記ピストンロッドの外周面に摺接することを特徴とするダストブーツ。 - 前記ダンパの伸長行程及び収縮行程のそれぞれで、前記リップ部の異なる摺接面が前記ピストンロッドの外周面に摺接するように、前記ピストンロッドの移動方向に応じて弾性変形する変形部をさらに備えることを特徴とする請求項1に記載のダストブーツ。
- 前記リップ部の摺接面は、
前記ダンパの中立状態において前記ピストンロッドの外周面に摺接する第1摺接面と、
前記ダンパの伸長行程において前記ピストンロッドの外周面に摺接する第2摺接面と、
前記ダンパの収縮行程において前記ピストンロッドの外周面に摺接する第3摺接面と、
を備えることを特徴とする請求項1又は請求項2に記載のダストブーツ。 - 前記リップ部は、前記ピストンロッドの中心軸を含む断面形状が多角形のリング部材であり、
前記第1摺接面は、前記ピストンロッドの外周面と平行な内周面であり、
前記第2摺接面及び前記第3摺接面は、前記第1摺接面に垂直であることを特徴とする請求項3に記載のダストブーツ。 - 前記リップ部は、前記ピストンロッドの中心軸を含む断面形状が多角形のリング部材であり、
前記第1摺接面は、前記ピストンロッドの外周面と平行な内周面であり、
前記第2摺接面及び前記第3摺接面は、前記第1摺接面との成す角度が鈍角であることを特徴とする請求項3に記載のダストブーツ。
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN200880125968XA CN101932848B (zh) | 2008-03-31 | 2008-03-31 | 防尘罩 |
JP2010505173A JP4997332B2 (ja) | 2008-03-31 | 2008-03-31 | ダストブーツ |
PCT/JP2008/056376 WO2009122513A1 (ja) | 2008-03-31 | 2008-03-31 | ダストブーツ |
KR1020107021834A KR101245486B1 (ko) | 2008-03-31 | 2008-03-31 | 더스트 부트 |
TW097122374A TW200940372A (en) | 2008-03-31 | 2008-06-16 | Dust boot |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2008/056376 WO2009122513A1 (ja) | 2008-03-31 | 2008-03-31 | ダストブーツ |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2009122513A1 true WO2009122513A1 (ja) | 2009-10-08 |
Family
ID=41134934
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2008/056376 WO2009122513A1 (ja) | 2008-03-31 | 2008-03-31 | ダストブーツ |
Country Status (5)
Country | Link |
---|---|
JP (1) | JP4997332B2 (ja) |
KR (1) | KR101245486B1 (ja) |
CN (1) | CN101932848B (ja) |
TW (1) | TW200940372A (ja) |
WO (1) | WO2009122513A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2011202760A (ja) * | 2010-03-26 | 2011-10-13 | Nok Corp | 密封装置 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01143538U (ja) * | 1988-03-25 | 1989-10-02 | ||
JP2003148625A (ja) * | 2001-11-09 | 2003-05-21 | Kayaba Ind Co Ltd | ダストリップ |
JP2007071246A (ja) * | 2005-09-05 | 2007-03-22 | Kayaba Ind Co Ltd | ダストブーツ |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58177638U (ja) | 1982-05-24 | 1983-11-28 | 株式会社昭和製作所 | 緩衝器のダストブ−ツ取付部構造 |
JPH02143538U (ja) * | 1989-05-09 | 1990-12-05 | ||
JP4055845B2 (ja) * | 2002-05-08 | 2008-03-05 | 株式会社ショーワ | 油圧緩衝器のダストカバー受け構造 |
JP4476688B2 (ja) | 2004-05-10 | 2010-06-09 | カヤバ工業株式会社 | 単筒型油圧緩衝器 |
CN2814010Y (zh) * | 2005-08-10 | 2006-09-06 | 万向钱潮股份有限公司 | 防尘减震器 |
KR20070087794A (ko) * | 2005-12-02 | 2007-08-29 | 주식회사 만도 | 쇽업소버 |
-
2008
- 2008-03-31 JP JP2010505173A patent/JP4997332B2/ja not_active Expired - Fee Related
- 2008-03-31 WO PCT/JP2008/056376 patent/WO2009122513A1/ja active Application Filing
- 2008-03-31 CN CN200880125968XA patent/CN101932848B/zh not_active Expired - Fee Related
- 2008-03-31 KR KR1020107021834A patent/KR101245486B1/ko active IP Right Grant
- 2008-06-16 TW TW097122374A patent/TW200940372A/zh not_active IP Right Cessation
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01143538U (ja) * | 1988-03-25 | 1989-10-02 | ||
JP2003148625A (ja) * | 2001-11-09 | 2003-05-21 | Kayaba Ind Co Ltd | ダストリップ |
JP2007071246A (ja) * | 2005-09-05 | 2007-03-22 | Kayaba Ind Co Ltd | ダストブーツ |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2011202760A (ja) * | 2010-03-26 | 2011-10-13 | Nok Corp | 密封装置 |
Also Published As
Publication number | Publication date |
---|---|
JP4997332B2 (ja) | 2012-08-08 |
CN101932848A (zh) | 2010-12-29 |
TWI352027B (ja) | 2011-11-11 |
KR101245486B1 (ko) | 2013-03-25 |
TW200940372A (en) | 2009-10-01 |
CN101932848B (zh) | 2012-05-30 |
JPWO2009122513A1 (ja) | 2011-07-28 |
KR20100122106A (ko) | 2010-11-19 |
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