WO1999035424A1 - Control valve for a hydraulic motor - Google Patents
Control valve for a hydraulic motor Download PDFInfo
- Publication number
- WO1999035424A1 WO1999035424A1 PCT/DK1999/000010 DK9900010W WO9935424A1 WO 1999035424 A1 WO1999035424 A1 WO 1999035424A1 DK 9900010 W DK9900010 W DK 9900010W WO 9935424 A1 WO9935424 A1 WO 9935424A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- annular
- return
- throttle
- control valve
- neutral position
- Prior art date
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
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
- F15B13/0401—Valve members; Fluid interconnections therefor
- F15B13/0402—Valve members; Fluid interconnections therefor for linearly sliding valves, e.g. spool valves
-
- 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
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
Definitions
- the invention concerns a control valve for a hydraulic motor with a slide extending in a housing bore, the slide having on both sides of a neutral position working areas, each allocated to a working direction, in which working areas an inflow throttle and approximately at the same time also a return throttle open after passing through a deadband.
- a control valve of this kind is known from DE 38 02 672 C2.
- the housing bore has a central annular pump groove connected with a pump connection, having on either side an annular motor groove connected with a motor connection and on the outside of this an annular tank groove connected with a tank connection.
- the slide has two annular distributor grooves, each arranged in the area of an annular motor groove, from which distributor grooves originate inflow pockets extending in the direction of the annular pump grooves for forming the inflow throttles and return pockets extending in the direction of the annular tank grooves for forming the return throttles.
- a deadband occurs - based on the neutral position, in which the inflow pressure increases from a standby value to the required working pressure, and immediately after the deadband a control area occurs, in which both inflow throttle and return throttle are active.
- This is particularly important, when the motor, at least in one working direction, is loadable by an external force, for example by a crane boom, a lifting platform, a stacker truck etc., in connection with which the return throttle must prevent a too fast lowering.
- the known control valve cannot be used, when in the return path a pressure-relief valve is provided, which opens on occurrence of the overpressure and must drain off pressure fluid for as long as it takes to relieve the overpressure.
- the reason is that in the neutral position of the control valve the return throttle is closed, so that the overpressure fluid cannot flow off.
- pressure-relief valves are required. When, however, the return throttle is not completely closed, meaning that in the neutral position an opening remains, this leads to a reduction of the working area.
- this task is solved in that the return throttle is open in the neutral position and closes on passing through the deadband.
- the return throttle has a new characteristic.
- a displacement of the control valve from the neutral position initially causes a closing and subse- quently an opening movement.
- pressure fluid drained off by the pressure-relief valve can be lead off to the tank.
- the return throttle is fully active over the whole control area following the deadband.
- the additional pocket axially overlaps both a return pocket and a load pressure sensing opening and is displaced in relation to both in the circumferential direction.
- both pockets and the load pressure sensing opening only need small dimensions, they can be arranged on the slide surface without difficulty.
- Fig. 1 the opening characteristic of a return throttle and an inflow throttle with a control valve ac- cording to the invention
- Fig. 2 a section through a constructive embodiment of such a control valve.
- Fig. 1 shows the opening cross section F in mm 2 across the adjustment distance s in mm of the slide of a control valve.
- the first quadrant Ql refers to a return throttle
- the second quadrant Q2 refers to an inflow throttle.
- the latter is closed over a deadband c and then opens as shown by the curve Z.
- the curve for the return throttle comprises two sections Rl and R2.
- the section Rl shows that the return throttle opens almost simultaneously with the inflow throttle, or rather, at a distance b from the neutral position, that is, temporally shortly before the inflow throttle.
- the return throttle is open in the neutral position and closes after passing through a section a of the deadband, so that an adjustment distance section b-a remains, in which the return throttle is completely closed.
- Fig. 2 shows a valve housing 1 with a housing bore 2, in which a slide 3 is axially adjustable. A displacement from the neutral position, for example to the right, as sug- gested by the arrow s, leads to the diagram in Fig. 1.
- the control valve made this way is connected in series with a compensation valve 4, which maintains a constant pressure drop at the inflow throttle of the control valve. In stead of this flow control, the control valve can also be part of a pressure control or have another desired function.
- Additional pockets 20 and 21 also belong to the return throttles, which pockets in the neutral position each bypass a connection 22 and 23 between the annular motor groove 6 and the annular tank groove 8 or the annular motor groove 7 and the annular tank groove 9, respectively.
- the additional pockets 20 and 21 can be provided once or multiple times. Most often, they are distributed evenly on the circumference.
- Fig. 2 also shows the dead zone c, which the slide 3 must pass when leaving the neutral position, before the inflow pocket 12 or 13 reaches the annular pump groove 5.
- the distance b is the distance to be passed by the slide 3 when leaving the neutral position, before the return pocket 16 or 17 reaches the annular tank groove 8 or 9.
- load pressure sensing openings 24, 25, 26 and 27 are arranged on the slide surface, which, like the return pockets 16 and 17 and the additional pockets 20 an 21, only have a limited extension in the circumferential direction, so that the two pockets and one load pressure sensing opening can be arranged in axial overlapping.
- the pressure-relief valve arranged in the return side motor path can be an independent spring loaded non-return valve, but can also be an additional function of another valve, for example a load retaining valve.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Pressure Circuits (AREA)
- Safety Valves (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE69916573T DE69916573T2 (en) | 1998-01-12 | 1999-01-08 | CONTROL VALVE OF A HYDROMOTOR |
EP99900440A EP1046003B1 (en) | 1998-01-12 | 1999-01-08 | Control valve for a hydraulic motor |
AU19603/99A AU1960399A (en) | 1998-01-12 | 1999-01-08 | Control valve for a hydraulic motor |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19800720A DE19800720C2 (en) | 1998-01-12 | 1998-01-12 | Control valve for a hydraulic motor |
DE19800720.5 | 1998-01-12 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1999035424A1 true WO1999035424A1 (en) | 1999-07-15 |
Family
ID=7854324
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DK1999/000010 WO1999035424A1 (en) | 1998-01-12 | 1999-01-08 | Control valve for a hydraulic motor |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1046003B1 (en) |
AU (1) | AU1960399A (en) |
DE (2) | DE19800720C2 (en) |
WO (1) | WO1999035424A1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10107532A1 (en) * | 2001-02-17 | 2002-08-29 | Mannesmann Rexroth Ag | Directional control valve for load-independent control of a hydraulic consumer with regard to direction and speed |
CN102398866B (en) * | 2011-10-26 | 2013-12-25 | 徐州重型机械有限公司 | Crane luffing control valve and crane luffing hydraulic system |
CN104235098B (en) * | 2013-12-23 | 2016-08-17 | 江苏恒立液压科技有限公司 | Fluid pressure valve device |
EP2891806A1 (en) | 2014-01-03 | 2015-07-08 | Danfoss Power Solutions Aps | A hydraulic valve arrangement |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3802672A1 (en) * | 1988-01-29 | 1989-08-10 | Danfoss As | HYDRAULIC CONTROL VALVE WITH PRESSURE SENSOR |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2601999C3 (en) * | 1976-01-21 | 1980-02-21 | Danfoss A/S, Nordborg (Daenemark) | Arrangement for influencing the amount of work of a servo motor |
SE439183B (en) * | 1979-03-23 | 1985-06-03 | Nordhydraulic Ab | HYDRAULIC DIRECTION VALVE |
DE4413216C2 (en) * | 1994-04-15 | 2003-02-06 | Bosch Gmbh Robert | Hydraulic directional valve |
-
1998
- 1998-01-12 DE DE19800720A patent/DE19800720C2/en not_active Expired - Fee Related
-
1999
- 1999-01-08 AU AU19603/99A patent/AU1960399A/en not_active Abandoned
- 1999-01-08 WO PCT/DK1999/000010 patent/WO1999035424A1/en active IP Right Grant
- 1999-01-08 EP EP99900440A patent/EP1046003B1/en not_active Expired - Lifetime
- 1999-01-08 DE DE69916573T patent/DE69916573T2/en not_active Expired - Lifetime
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3802672A1 (en) * | 1988-01-29 | 1989-08-10 | Danfoss As | HYDRAULIC CONTROL VALVE WITH PRESSURE SENSOR |
Also Published As
Publication number | Publication date |
---|---|
AU1960399A (en) | 1999-07-26 |
EP1046003A1 (en) | 2000-10-25 |
DE69916573T2 (en) | 2004-08-19 |
DE19800720A1 (en) | 1999-07-15 |
DE19800720C2 (en) | 2001-10-31 |
EP1046003B1 (en) | 2004-04-21 |
DE69916573D1 (en) | 2004-05-27 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US5287794A (en) | Hydraulic motor with inlet fluid supplemented by fluid from contracting chamber | |
US4624445A (en) | Lockout valve | |
US5857330A (en) | Travelling control circuit for a hydraulically driven type of travelling apparatus | |
EP1407086B1 (en) | Hydraulic control system | |
US20100300552A1 (en) | Hydraulic valve device | |
US6971407B2 (en) | Hydraulic valve arrangement | |
US4204459A (en) | Combination check and flow control valve for hydraulic systems | |
US4259986A (en) | Control apparatus for a hydraulic power consumer | |
US20110132476A1 (en) | Hydraulic valve device | |
US4338856A (en) | Dual pilot counterbalance valve | |
WO1999035407A1 (en) | Control arrangement for a hydraulic motor | |
EP1046003B1 (en) | Control valve for a hydraulic motor | |
US6256986B1 (en) | Hydrostatic drive system | |
EP0088406A2 (en) | Control valve for double-acting piston and cylinder assembly | |
US5778929A (en) | Directional control valve assembly having a pressure compensation valve | |
US3455322A (en) | Pressure compensated diverter valve | |
EP0836678B1 (en) | Hydraulic valve to maintain control in fluid-loss condition | |
CZ103096A3 (en) | Hydraulic rack device | |
US3464444A (en) | Pilot controllable valve mechanism | |
US4338962A (en) | Control and relief valves | |
US3358711A (en) | Valve | |
GB2210678A (en) | Control system for a hydraulic lift | |
US6223773B1 (en) | Check valve assembly | |
DE2810375A1 (en) | CONTROL DEVICE FOR HYDRAULIC POWER TRANSFER | |
USRE29292E (en) | Control valve means for fluid motors |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): AM AT AU BA BG BR BY CA CH CN CZ DE DK EE ES FI GB GE HR HU IL IN IS JP KR KZ LT LU LV MD MK MX NO NZ PL PT RO RU SE SG SI SK TR UA US UZ VN YU |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): AM AZ BY KG KZ MD RU TJ TM AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE |
|
DFPE | Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101) | ||
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
REG | Reference to national code |
Ref country code: DE Ref legal event code: 8642 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 1999900440 Country of ref document: EP |
|
NENP | Non-entry into the national phase |
Ref country code: KR |
|
WWP | Wipo information: published in national office |
Ref document number: 1999900440 Country of ref document: EP |
|
NENP | Non-entry into the national phase |
Ref country code: CA |
|
WWG | Wipo information: grant in national office |
Ref document number: 1999900440 Country of ref document: EP |