EP0764241A1 - Hydraulic power cylinder - Google Patents
Hydraulic power cylinderInfo
- Publication number
- EP0764241A1 EP0764241A1 EP95920904A EP95920904A EP0764241A1 EP 0764241 A1 EP0764241 A1 EP 0764241A1 EP 95920904 A EP95920904 A EP 95920904A EP 95920904 A EP95920904 A EP 95920904A EP 0764241 A1 EP0764241 A1 EP 0764241A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- ring
- working cylinder
- channel
- piston
- hydraulic working
- 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
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
- F15B15/149—Fluid interconnections, e.g. fluid connectors, passages
-
- 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
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/04—Special measures taken in connection with the properties of the fluid
- F15B21/044—Removal or measurement of undissolved gas, e.g. de-aeration, venting or bleeding
Definitions
- the invention relates to a hydraulic working cylinder with a piston, the piston rod of which is connected to a adjusting device.
- the piston divides the working cylinder into alternately pressurizable pressure chambers. Line connections for the supply of the pressure oil lead into the pressure chambers.
- the invention has for its object to provide a device which enables constant self-ventilation even with line connections attached to the bottom of the working cylinder. This requirement should be able to be realized with little additional effort without increasing the steering.
- each case a ring with a channel corresponding to the connections in the sectional plane of the line connections in the working cylinder.
- This channel is connected to the pressure chamber via an inlet opening.
- the inlet opening is at the highest point of the working cylinder.
- the channel of the ring is U-shaped and open on the outside diameter, the channel extending over the entire circumference of the ring.
- the outwardly open ring can also run only over a portion of the circumference.
- the ring channel is easy to work in and its short length ensures a high flow rate rapid removal of the pressure medium with the enclosed air.
- the ring can also be connected to a stiffening web of an axial seal. The ring is then advantageously formed in one piece on the stiffening web. This embodiment has the advantage of joint installation of the axial seal with the ring and simpler storage.
- the ring can also be hooked into the stiffening ring of the axial seal by a snap connection.
- FIG. 1 shows a partial longitudinal section through a working cylinder
- Fig. 2 shows a cross section along the line II-II in Fig. 1 and
- FIG. 1 and 2 show a working cylinder 1 with a continuous piston rod 2, which carries a piston 3.
- the piston 3 is drawn in its left end position. It divides the working cylinder 1 into a pressure chamber 4 and 5.
- the arrangement according to the invention can be used on both line connections, but for the sake of simplicity only one line connection 6 is drawn for the supply and discharge of the pressure medium.
- An axial seal 7 is inserted on one side of the line connection 6.
- the piston 3 contains a seal 8. Since the seal 8 of the piston 3 must not pass under a bore 6A of the line connection 6, a space around the bore 6A cannot be used for the stroke of the piston 3.
- a ring 10 is inserted in this space, which lies in the cross-sectional plane of the line connection.
- This ring 10 can be fixed, for example, by an indentation 11 of the working cylinder 1 in a notch 12.
- the ring 10 has a U-shaped channel 13, which can run partially or over the entire circumference. It is essential that an inlet opening 14 is provided in the pressure chamber 4 at the highest point of the ring 10. This inlet opening 14 is connected to the line connection 6 via the channel 13. The arrangement according to the invention ensures that a pressure medium extraction is always at the highest point of the
- Axial seal 15 for a piston rod 16 This axial seal 15 has a stiffening ring 17, on which a ring 20 connected to the line connection 18 is formed. This ring 20 also has an inlet opening 21.
- a ring 22 can also be hooked into a stiffening ring 24 of an axial seal 25 with a snap connection 23.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Actuator (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4419213A DE4419213A1 (en) | 1994-06-01 | 1994-06-01 | Hydraulic actuating cylinder |
DE4419213 | 1994-06-01 | ||
PCT/EP1995/002020 WO1995033137A1 (en) | 1994-06-01 | 1995-05-26 | Hydraulic power cylinder |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0764241A1 true EP0764241A1 (en) | 1997-03-26 |
EP0764241B1 EP0764241B1 (en) | 1998-04-01 |
Family
ID=6519563
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95920904A Expired - Lifetime EP0764241B1 (en) | 1994-06-01 | 1995-05-26 | Hydraulic power cylinder |
Country Status (6)
Country | Link |
---|---|
US (1) | US5697287A (en) |
EP (1) | EP0764241B1 (en) |
JP (1) | JP3576559B2 (en) |
BR (1) | BR9507807A (en) |
DE (2) | DE4419213A1 (en) |
WO (1) | WO1995033137A1 (en) |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19543593A1 (en) * | 1995-11-23 | 1997-05-28 | Wabco Gmbh | Working cylinder |
IT1284830B1 (en) * | 1996-09-27 | 1998-05-22 | New Holland Italia Spa | HYDRAULIC JACK. |
US6004117A (en) * | 1998-05-29 | 1999-12-21 | Qualicon Inc. | Displacement pump |
DE29922530U1 (en) | 1999-12-21 | 2000-04-20 | Claas Industrietechnik GmbH, 33106 Paderborn | Single-acting piston-cylinder unit |
DE10151930B4 (en) * | 2001-10-20 | 2011-02-24 | Audi Ag | venting device |
DE10314242A1 (en) * | 2003-03-29 | 2004-11-18 | Zf Lenksysteme Gmbh | servo cylinder |
DE102004063120A1 (en) * | 2004-12-22 | 2006-07-13 | Thyssenkrupp Presta Steertec Gmbh | Housing for a hydraulic steering system |
US20080092683A1 (en) * | 2005-10-17 | 2008-04-24 | Spetz John W | Venturi passageway for a steering assembly |
DE102006030125A1 (en) * | 2006-06-28 | 2008-01-17 | Thyssenkrupp Presta Steertec Gmbh | Bleeding a hydraulic steering system |
US20110072962A1 (en) * | 2009-09-30 | 2011-03-31 | Control Solutions, LLC | Self-bleeding double action hydraulic cylinder |
CN102878149B (en) * | 2012-10-23 | 2015-09-23 | 湖南特力液压有限公司 | Sealing mounting structure and Sealing installation method |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2937502A (en) * | 1959-04-13 | 1960-05-24 | Roy E Kenyon | Equalizing means for hydraulic brake system |
DE2406565C3 (en) * | 1974-02-12 | 1978-03-23 | Zahnradfabrik Friedrichshafen Ag, 7990 Friedrichshafen | Hydraulic power steering, in particular for motor vehicles |
JPS55135211A (en) * | 1979-04-10 | 1980-10-21 | Aisin Seiki Co Ltd | Air-bleeder for hydraulic cylinder |
GB2074271B (en) * | 1980-04-19 | 1984-06-27 | Lucas Industries Ltd | Bleeding hydraulic pressure cylinders |
DE3635020C2 (en) * | 1985-10-26 | 1994-08-04 | Volkswagen Ag | Form-fitting fastening of a circular cylindrical stop disc under axial force in a cylinder |
DE4139085A1 (en) * | 1991-11-28 | 1993-06-03 | Bosch Gmbh Robert | HYDRAULIC AUXILIARY STEERING DEVICE FOR MOTOR VEHICLES |
DE9201972U1 (en) * | 1992-02-15 | 1993-06-17 | Hydraulik Techniek, Emmen | Pull cylinder |
US5390586A (en) * | 1994-03-28 | 1995-02-21 | Jones; Peter D. | Self-bleeding hydraulic cylinder |
-
1994
- 1994-06-01 DE DE4419213A patent/DE4419213A1/en not_active Withdrawn
-
1995
- 1995-05-26 US US08/737,785 patent/US5697287A/en not_active Expired - Fee Related
- 1995-05-26 EP EP95920904A patent/EP0764241B1/en not_active Expired - Lifetime
- 1995-05-26 WO PCT/EP1995/002020 patent/WO1995033137A1/en active IP Right Grant
- 1995-05-26 DE DE59501785T patent/DE59501785D1/en not_active Expired - Lifetime
- 1995-05-26 BR BR9507807A patent/BR9507807A/en not_active IP Right Cessation
- 1995-05-26 JP JP50030296A patent/JP3576559B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO9533137A1 * |
Also Published As
Publication number | Publication date |
---|---|
BR9507807A (en) | 1997-09-16 |
JP3576559B2 (en) | 2004-10-13 |
EP0764241B1 (en) | 1998-04-01 |
US5697287A (en) | 1997-12-16 |
DE4419213A1 (en) | 1995-12-07 |
JPH10500759A (en) | 1998-01-20 |
WO1995033137A1 (en) | 1995-12-07 |
DE59501785D1 (en) | 1998-05-07 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
DE19546356A1 (en) | Fluid powered linear actuator | |
EP0579037A1 (en) | Hydropneumatic pressure intensifier | |
DE3118583A1 (en) | THREE-POSITION GEAR CYLINDER | |
EP0356780B1 (en) | Reservoir for a pressure fluid circuit, especially for an aircraft hydraulic circuit | |
DE4439667A1 (en) | Working cylinder | |
EP0764241A1 (en) | Hydraulic power cylinder | |
EP0066274A1 (en) | Valve arrangement for increasing the operating speed of a working cylinder | |
EP0323972A1 (en) | Rotary gate valve for hydraulic servo-assisted steering systems. | |
EP0737610A2 (en) | Hydraulic rack-and-pinion steering | |
DE2648608A1 (en) | Valve for single or multistage cylinder - has back pressure valve to keep smaller piston in rod of first moving | |
DE10026616B4 (en) | Pressure booster, in particular hydropneumatic pressure booster | |
DE19725944C1 (en) | Hydraulic assist motor vehicle steering rack | |
DE102011101019A1 (en) | Multistage hydraulic cylinder for mechanical conversion of linear or rotary movements of hydraulic scissor lift, has hole through which hydraulic oil is supplied after larger piston reaches its end position | |
DE2845301C3 (en) | Steering valve for power steering | |
EP0740083B1 (en) | Pressure cut-off valve with a shuttle valve piston | |
DE2347043A1 (en) | DEVICE FOR CONTROLLING GEAR CHANGE AND / OR REVERSE DRIVES | |
DE3606237A1 (en) | Double-travel brake valve | |
EP0808267B1 (en) | Hydraulic steering system with load signal | |
DE102018217820A1 (en) | Hydraulic control arrangement and hydraulic axis | |
DE10212635A1 (en) | Device and method for discharging air from a vehicle articulated transmission housing | |
EP0519185A1 (en) | Fluid pressure operated actuator | |
EP0222735A1 (en) | Single-acting cylinder | |
DE4222636C2 (en) | Continuously adjustable belt transmission | |
DE10314242A1 (en) | servo cylinder | |
DE2523184A1 (en) | Multiple hydraulic ram synchronising equipment - has driving pistons for each ram all coupled together to move over same stroke |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 19970102 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): DE FR GB IT |
|
GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
17Q | First examination report despatched |
Effective date: 19970729 |
|
GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
ITF | It: translation for a ep patent filed |
Owner name: DE DOMINICIS & MAYER S.R.L. |
|
GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): DE FR GB IT |
|
GBT | Gb: translation of ep patent filed (gb section 77(6)(a)/1977) |
Effective date: 19980402 |
|
REF | Corresponds to: |
Ref document number: 59501785 Country of ref document: DE Date of ref document: 19980507 |
|
ET | Fr: translation filed | ||
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
26N | No opposition filed | ||
REG | Reference to a national code |
Ref country code: GB Ref legal event code: IF02 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED. Effective date: 20050526 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 20070419 Year of fee payment: 13 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 20070518 Year of fee payment: 13 |
|
GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 20080526 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST Effective date: 20090119 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20080602 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20080526 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 20120523 Year of fee payment: 18 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20131203 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R119 Ref document number: 59501785 Country of ref document: DE Effective date: 20131203 |