EP1270958A1 - Hydraulikzylinder - Google Patents
Hydraulikzylinder Download PDFInfo
- Publication number
- EP1270958A1 EP1270958A1 EP01305519A EP01305519A EP1270958A1 EP 1270958 A1 EP1270958 A1 EP 1270958A1 EP 01305519 A EP01305519 A EP 01305519A EP 01305519 A EP01305519 A EP 01305519A EP 1270958 A1 EP1270958 A1 EP 1270958A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rod body
- hydraulic cylinder
- rod
- bearing
- side chamber
- 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.)
- Granted
Links
Images
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 a hydraulic cylinder, and particularly 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 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 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.
- 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 from so-called bottom side, the hydraulic cylinder being optimum for permanently securing the desired operation without bringing forth abrasion of a bearing and damage of a dust seal caused by rust or scratch in the outer circumference of a rod body.
- a hydraulic cylinder fundamentally constituted such that the cylinder is operated to be extended when liquid pressure from outside is supplied to a liquid chamber which is a counter rod side chamber partitioned by a piston slidably inserted into a cylinder body, the cylinder is operated to be contracted when a supply of liquid pressure to the liquid chamber is released whereas a rod body having a proximal end connected to a piston is moved into the cylinder body due to own weight or load exerting on the extreme end, and a head member forming an open end of a cylinder body for moving in and out of the rod body has a bearing for causing the outer circumference of the rod body to sliding contact therewith and a dust seal, the hydraulic cylinder, in the head member, comprising in series, a lubrication means in sliding contact with the outer circumference of the rod body on the bearing side between the bearing and the dust seal, and an oil seal in sliding contact with the outer circumference of the rod body on the dust seal side.
- the lubrication means is that for example, a lubricating material such as grease is stored in an inner circumferential groove at a predetermined position formed in the inner circumference of the head member, or a suitable impregnate material is received in the inner circumferential groove, the impregnate material being impregnated with a suitable lubricating material.
- a lubricating material such as grease is stored in an inner circumferential groove at a predetermined position formed in the inner circumference of the head member, or a suitable impregnate material is received in the inner circumferential groove, the impregnate material being impregnated with a suitable lubricating material.
- the rod side chamber partitioned by a piston within the cylinder body comprising an air chamber is communicated with the atmosphere outside the cylinder body through a communication hole bored in the cylinder body, or is set to an air spring chamber having a seal construction not in communication with the atmosphere outside the cylinder body while being an air chamber.
- 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 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 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 bearing 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 enables 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 bring forth rust or scratch in the outer circumference of the rod body but is optimum for permanently securing the desired operation.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Actuator (AREA)
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2001628341 DE60128341T2 (de) | 2001-06-26 | 2001-06-26 | Hydraulikzylinder |
ES01305519T ES2284594T3 (es) | 2001-06-26 | 2001-06-26 | Cilindro hidraulico. |
EP01305519A EP1270958B1 (de) | 2001-06-26 | 2001-06-26 | Hydraulikzylinder |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP01305519A EP1270958B1 (de) | 2001-06-26 | 2001-06-26 | Hydraulikzylinder |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1270958A1 true EP1270958A1 (de) | 2003-01-02 |
EP1270958B1 EP1270958B1 (de) | 2007-05-09 |
Family
ID=8182058
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01305519A Expired - Lifetime EP1270958B1 (de) | 2001-06-26 | 2001-06-26 | Hydraulikzylinder |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1270958B1 (de) |
DE (1) | DE60128341T2 (de) |
ES (1) | ES2284594T3 (de) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20160025220A1 (en) * | 2014-07-22 | 2016-01-28 | Spx Corporation | Actuation Rod Lubrication System And Method |
CN107407303A (zh) * | 2015-03-20 | 2017-11-28 | Kyb株式会社 | 单动型液压缸 |
CN107435669A (zh) * | 2017-08-17 | 2017-12-05 | 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 |
US10100928B2 (en) | 2014-07-22 | 2018-10-16 | Spx Flow, Inc. | Floating piston |
US10107314B2 (en) | 2013-04-12 | 2018-10-23 | Spx Flow, Inc. | Cylinder having a floating piston, low profile swivel cap, and lubricated rod |
WO2019053397A1 (en) * | 2017-09-12 | 2019-03-21 | Metrol Springs Limited | HOUSING |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8549986B2 (en) | 2010-04-06 | 2013-10-08 | Baker Hughes Incorporated | Energy storage device, actuator and method |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4759265A (en) * | 1986-05-17 | 1988-07-26 | Kurt Stoll | Piston and cylinder unit |
US5517898A (en) * | 1995-03-29 | 1996-05-21 | Korea Institute Of Machinery & Materials | Pneumatic cylinder utilizing cushioning sleeves, quick exhaust valves and quick supply valves |
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 |
-
2001
- 2001-06-26 DE DE2001628341 patent/DE60128341T2/de not_active Expired - Lifetime
- 2001-06-26 ES ES01305519T patent/ES2284594T3/es not_active Expired - Lifetime
- 2001-06-26 EP EP01305519A patent/EP1270958B1/de not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4759265A (en) * | 1986-05-17 | 1988-07-26 | Kurt Stoll | Piston and cylinder unit |
US5517898A (en) * | 1995-03-29 | 1996-05-21 | Korea Institute Of Machinery & Materials | Pneumatic cylinder utilizing cushioning sleeves, quick exhaust valves and quick supply valves |
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 (2)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 1997, no. 11 28 November 1997 (1997-11-28) * |
PATENT ABSTRACTS OF JAPAN vol. 2000, no. 11 3 January 2001 (2001-01-03) * |
Cited By (10)
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 |
US20160025220A1 (en) * | 2014-07-22 | 2016-01-28 | Spx Corporation | Actuation Rod Lubrication System And Method |
WO2016014663A1 (en) * | 2014-07-22 | 2016-01-28 | Spx Flow, Inc. | Actuation rod lubrication system and method |
US10100928B2 (en) | 2014-07-22 | 2018-10-16 | Spx Flow, Inc. | Floating piston |
CN107407303A (zh) * | 2015-03-20 | 2017-11-28 | Kyb株式会社 | 单动型液压缸 |
CN107407303B (zh) * | 2015-03-20 | 2020-07-24 | Kyb株式会社 | 单动型液压缸 |
CN107435669A (zh) * | 2017-08-17 | 2017-12-05 | 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 |
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 |
WO2019053397A1 (en) * | 2017-09-12 | 2019-03-21 | Metrol Springs Limited | HOUSING |
US11486418B2 (en) | 2017-09-12 | 2022-11-01 | Metrol Springs Limited | Seal housing |
Also Published As
Publication number | Publication date |
---|---|
DE60128341T2 (de) | 2007-12-13 |
DE60128341D1 (de) | 2007-06-21 |
EP1270958B1 (de) | 2007-05-09 |
ES2284594T3 (es) | 2007-11-16 |
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