EP1270958B1 - Vérin hydraulique - Google Patents

Vérin hydraulique Download PDF

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Publication number
EP1270958B1
EP1270958B1 EP01305519A EP01305519A EP1270958B1 EP 1270958 B1 EP1270958 B1 EP 1270958B1 EP 01305519 A EP01305519 A EP 01305519A EP 01305519 A EP01305519 A EP 01305519A EP 1270958 B1 EP1270958 B1 EP 1270958B1
Authority
EP
European Patent Office
Prior art keywords
rod body
hydraulic cylinder
outer circumference
head member
body side
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP01305519A
Other languages
German (de)
English (en)
Other versions
EP1270958A1 (fr
Inventor
Susumu Niwa
Susumu Kawai
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
KYB Corp
Original Assignee
Kayaba Industry Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kayaba Industry Co Ltd filed Critical Kayaba Industry Co Ltd
Priority to EP01305519A priority Critical patent/EP1270958B1/fr
Priority to DE2001628341 priority patent/DE60128341T2/de
Priority to ES01305519T priority patent/ES2284594T3/es
Publication of EP1270958A1 publication Critical patent/EP1270958A1/fr
Application granted granted Critical
Publication of EP1270958B1 publication Critical patent/EP1270958B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423—Component parts; Constructional details
    • F15B15/1433—End caps

Definitions

  • the present invention relates to an improvement in a single-acting type hydraulic cylinder suitable for use with a forklift.
  • a single-acting type hydraulic cylinder for a forklift is operated to be extended, for example, as shown in FIG. 2, when liquid pressure P is supplied from the outside to a liquid chamber R which is a chamber on the counter rod body side partitioned by a piston 2 slidably inserted into a cylinder body 1.
  • the hydraulic cylinder is operated to be contracted when a supply of liquid pressure P to the liquid chamber R is released whereas a rod body 3 having a proximal end connected to the piston 2 gets into the cylinder body 1 due to own weight or load exerting on the extreme end to contract the liquid chamber R through the piston 2.
  • the rod body side chamber partitioned by the piston 2 within the cylinder body 1 which is an air chamber A is in many cases communicated with the atmosphere outside the cylinder body 1 through a communication hole 1a bored in the cylinder body 1.
  • the rod body 3 which moves in and out of the cylinder body 1 extends through an axial part of a head member 4 forming an open end of the cylinder body 1.
  • a bearing 5 for causing the outer circumference of the rod body 3 to sliding contact therewith is disposed in the inner circumference internally of the cylinder body 1 in the head member 4, and a dust seal 6 for causing the outer circumference of the rod body 3 to sliding contact therewith is disposed in the inner circumference of an open end in the head member 4.
  • a fork loaded with baggage when it is used for a forklift, a fork loaded with baggage can be moved up by the extension action thereof, and the fork loaded with baggage can be moved down by the contraction action thereof.
  • the bearing 5 compensates for slidability of the rod body 3 with respect to the head member 4 whereas the dust seal 6 wipes out so-called dust adhered to the outer circumference of the rod body 3 so that dust is not drawn into the cylinder body 1.
  • the conventional hydraulic cylinder shown in FIG. 2 involves a fear that when the rod body 3 is moved in and out of the cylinder body 1, so-called heat generation occurs, and rust, discoloration and scratch due to the heat generation appear on the outer circumference of the rod body 3.
  • FIG. 2 discloses the features of the pre-characterizing portion of Claim 1.
  • JP-A-2000-230503 discloses a double-acting type hydraulic cylinder wherein pressurized oil is supplied to both chambers partitioned by the piston.
  • JP-A-09-189303 discloses a liquid suction discharge device for supplying a liquid sample, a buffer solution and the like to a bioscientific (biochemical) or immunoassay analysis device or a separation/analysis means such as a column or the like.
  • a piston has two seals and a lubricant adhesive material is positioned in a clearance between the seals.
  • the present invention has been created in view of the above-described circumstances, and aims to provide a single-acting type hydraulic cylinder which is operated to be expanded and contracted by supply and discharge of liquid pressure to and from the so-called bottom side, wherein the hydraulic cylinder can operate without causing abrasion of a bearing and damage of a dust seal caused by rust or scratches in the outer circumference of a rod body.
  • a single-acting type hydraulic cylinder comprising:
  • the lubrication means may comprise a lubricating material such as grease stored in a circumferential groove formed in the inner circumference of the head member, or a material impregnated with lubricant and received in the circumferential groove.
  • a lubricating material such as grease stored in a circumferential groove formed in the inner circumference of the head member, or a material impregnated with lubricant and received in the circumferential groove.
  • the rod body side air chamber may communicate with the atmosphere outside the cylinder body through a communication hole bored in the cylinder body, or may be sealed to function as an air spring.
  • the hydraulic cylinder according to the present invention is also constituted fundamentally similar to the aforementioned conventional hydraulic cylinder, which is set to a single-acting hydraulic cylinder operated to be expanded and contracted by a supply and discharge of liquid pressure P from so-called bottom side.
  • a bearing 5 is provided in the inner circumference inside a cylinder body 1 in a head member 4, and a dust seal 6 is provided in the inner circumference of an open end in the head member 4.
  • a lubrication means 7 and an oil seal 8 are provided in series between the bearing 5 and the dust seal 6, that is, in series in an axial direction of a rod body 3.
  • the lubrication means 7 is located on the bearing 5 side, that is, on the air chamber A side within the cylinder body 1 whereas the oil seal 8 is located on the dust seal 6 side, that is, on the external side of the cylinder body 1 to prevent the lubrication effect of the lubrication means from so-called escaping outside the cylinder body 1 by the oil seal 8.
  • the lubrication means 7 stores, for example, a lubricating material 7a such as grease within an inner circumferential groove 4a at a predetermined position formed in the inner circumference of the head member 4.
  • the lubrication means 7 will suffice, as a result, to form a lubricating coating (not shown and not designated by symbol) between the inner circumference of the bearing 5 and the outer circumference of the rod body 3. Therefore, in place of the above-described constitution, a suitable impregnate material may be received in the inner circumferential groove 4a, and a suitable lubricating material, that is, the lubricating material 7a such as grease described above may be impregnated in the impregnate material.
  • the oil seal 8 comprises a so-called U packing received in an inner circumferential groove 4b at a predetermined position formed in the inner circumference of the head member 4 similar to the above-described inner circumferential groove 4a, the inner circumference of which comes in sliding contact with the outer circumference of the rod body 3.
  • the oil seal 8 has a function such that a lubrication coating from the internal side of the cylinder body 1 adhered to the outer circumference of the rod body 3, that is, from the lubrication means 7 side is remained on the lubrication means 7 side so as to prevent the coating from flowing out to the external side of the cylinder body 1, that is, to the dust seal 6 side.
  • the hydraulic cylinder according to the present invention is operated to be extended, for example, when it is used for a forklift, when liquid pressure P from the outside is supplied to a liquid chamber R partitioned by a piston 2 within the cylinder body 1, at which time a fork loaded with baggage is to be moved up.
  • the air chamber A which is a rod body side chamber partitioned within the cylinder body 1 is communicated with the atmosphere outside the cylinder body 1 through a communication hole 1a bored in the cylinder body 1, and therefore, the above-described expansion and contraction operation is realized without so-called resistance.
  • the outer circumference of the rod body 3 comes in sliding contact with not only the bearing 5 and the dust seal 6 disposed in the inner circumference of the head member 4 forming an open end of the cylinder body 1 but also the lubrication means 7 and the oil seal 8.
  • the bearing 5 secures slidability of the rod body 3 with respect to the cylinder body 1 whereas the dust seal 6 prevents entry of dust adhered to the outer circumference of the rod body 3 into the cylinder body 1.
  • the lubrication means 7 forms a lubrication coating between the inner circumference of the bearing 5 and the outer circumference of the rod body 3 to lower sliding friction therebetween, and the oil seal 8 is able to prevent the lubricating material 7a forming a lubrication coating from escaping to the external side of the cylinder body 1, thus permanently securing lubrication between the bearing 5 and the rod body 3.
  • the rod body side chamber partitioned by the piston 2 within the cylinder body 1 comprises the air chamber A which is communicated with the atmosphere outside the cylinder body 1 through the communication hole 1a bored in the cylinder body 1, but in place thereof, though not shown, there can be employed an air spring chamber having a seal construction in which the air chamber A is not communicated with the atmosphere outside the cylinder body 1.
  • the oil seal 8 is disposed adjacent to the dust seal 6, but a second lubrication means additional to the lubrication means 7 may be provided between the oil seal 8 and the dust seal 6.
  • the outer circumference of the rod body 3 which is so-called dry in the oil seal 8 can be maintained to be wet, which is advantageous in that further lubrication is secured.
  • the outer circumference of the rod body comes in sliding contact with the bearing disposed in the inner circumference of the head member forming an open end of the cylinder body to secure slidability of the rod body to the cylinder body;
  • the dust seal disposed in the inner circumference of the head member prevents dust adhered to the outer circumference of the rod body from entering the cylinder body;
  • the lubrication means disposed between the and the dust seal forms a lubrication coating between the inner circumference of the bearing and the outer circumference of the rod body to lower sliding friction therebetween;
  • the oil seal disposed in series with the lubrication means and in the inner circumference of the head member to prevent the lubricating material forming the lubrication coating from escaping to the external side of the cylinder body to permanently secure lubrication between the bearing and the rod body.
  • a single-acting type hydraulic cylinder subjected to expansion and contraction operation by supply and discharge of liquid pressure from the so-called bottom side, which does not cause rust or scratches in the outer circumference of the rod body during operation.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)

Claims (4)

  1. Vérin hydraulique du type à simple effet comprenant:
    un corps de vérin (1),
    un piston (2) reçu de façon à pouvoir coulisser dans le corps de vérin (1) pour séparer une chambre à air du côté du corps de tige (A) d'une chambre à liquide du côté opposé au corps de tige (R),
    un corps de tige (3) comportant une extrémité reliée au piston (2), et
    un élément de tête (4) à une extrémité de la chambre à air du côté du corps de tige (A) opposée au piston (2), l'élément de tête (4) comportant sur sa circonférence intérieure un palier (5) adjacent à la chambre à air du côté du corps de tige (A) et en contact coulissant avec la circonférence extérieure du corps de tige (3) et un joint d'étanchéité aux poussières (6) éloigné de la chambre à air du côté du corps de tige (A) et en contact coulissant avec la circonférence extérieure du corps de tige (3),
    où le vérin hydraulique peut être commandé pour être allongé lorsqu'un liquide sous pression (P) provenant de l'extérieur est fourni à la chambre à liquide du côté opposé au corps de tige (R) et peut être commandé pour être rétracté lorsque le liquide sous pression (P) est libéré de la chambre à liquide du côté opposé au corps de tige (R),
    caractérisé en ce que l'élément de tête (4) comprend en outre un moyen de lubrification (7) en contact coulissant avec la circonférence extérieure du corps de tige (3) entre le palier (5) et le joint d'étanchéité aux poussières (6), et un joint d'étanchéité à l'huile (8) en contact coulissant avec la circonférence extérieure du corps de tige (3) entre le moyen de lubrification (7) et le joint d'étanchéité aux poussières (6).
  2. Vérin hydraulique selon la revendication 1, dans lequel le moyen de lubrification (7) comprend un matériau de lubrification (7a), tel que de la graisse, stocké dans une gorge circonférentielle (4a) formée dans la circonférence intérieure de l'élément de tête (4).
  3. Vérin hydraulique selon la revendication 1, dans lequel le moyen de lubrification (7) comprend un matériau imprégné d'un lubrifiant et reçu dans une gorge circonférentielle (4a) formée dans la circonférence intérieure de l'élément de tête (4).
  4. Vérin hydraulique selon l'une quelconque des revendications précédentes, dans lequel la chambre à air du côté du corps de tige (A) est fermée hermétiquement pour fonctionner comme un ressort pneumatique.
EP01305519A 2001-06-26 2001-06-26 Vérin hydraulique Expired - Lifetime EP1270958B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP01305519A EP1270958B1 (fr) 2001-06-26 2001-06-26 Vérin hydraulique
DE2001628341 DE60128341T2 (de) 2001-06-26 2001-06-26 Hydraulikzylinder
ES01305519T ES2284594T3 (es) 2001-06-26 2001-06-26 Cilindro hidraulico.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP01305519A EP1270958B1 (fr) 2001-06-26 2001-06-26 Vérin hydraulique

Publications (2)

Publication Number Publication Date
EP1270958A1 EP1270958A1 (fr) 2003-01-02
EP1270958B1 true EP1270958B1 (fr) 2007-05-09

Family

ID=8182058

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01305519A Expired - Lifetime EP1270958B1 (fr) 2001-06-26 2001-06-26 Vérin hydraulique

Country Status (3)

Country Link
EP (1) EP1270958B1 (fr)
DE (1) DE60128341T2 (fr)
ES (1) ES2284594T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011127153A2 (fr) * 2010-04-06 2011-10-13 Baker Hughes Incorporated Dispositif de stockage d'énergie, organe de commande et procédé

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10107314B2 (en) 2013-04-12 2018-10-23 Spx Flow, Inc. Cylinder having a floating piston, low profile swivel cap, and lubricated rod
US10100928B2 (en) 2014-07-22 2018-10-16 Spx Flow, Inc. Floating piston
US20160025220A1 (en) * 2014-07-22 2016-01-28 Spx Corporation Actuation Rod Lubrication System And Method
JP6209550B2 (ja) * 2015-03-20 2017-10-04 Ｋｙｂ株式会社 単動型液圧シリンダ
CN107435669B (zh) * 2017-08-17 2019-11-19 浙江中控太阳能技术有限公司 一种带有自清洁装置的推杆
GB2566332B (en) 2017-09-12 2019-12-11 Metrol Springs Ltd Seal housing
CN111750001A (zh) * 2020-06-01 2020-10-09 瑞立集团瑞安汽车零部件有限公司 一种一体活塞封闭柱塞式内呼吸离合器助力器

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3616844C2 (de) * 1986-05-17 1995-05-24 Festo Kg Führungs- und Dichtungsanordnung für die Kolbenstange eines Kolben-Zylinder-Aggregats
KR0166223B1 (ko) * 1995-03-29 1998-12-01 서상기 공압실린더
JPH09189303A (ja) * 1995-11-08 1997-07-22 Tosoh Corp 液体吸入吐出装置
JP2000230503A (ja) * 1999-02-10 2000-08-22 Kayaba Ind Co Ltd 液圧シリンダの作動制御回路

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011127153A2 (fr) * 2010-04-06 2011-10-13 Baker Hughes Incorporated Dispositif de stockage d'énergie, organe de commande et procédé
WO2011127153A3 (fr) * 2010-04-06 2012-03-08 Baker Hughes Incorporated Dispositif de stockage d'énergie, organe de commande et procédé
US8549986B2 (en) 2010-04-06 2013-10-08 Baker Hughes Incorporated Energy storage device, actuator and method

Also Published As

Publication number Publication date
EP1270958A1 (fr) 2003-01-02
DE60128341T2 (de) 2007-12-13
ES2284594T3 (es) 2007-11-16
DE60128341D1 (de) 2007-06-21

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