EP0271076A2 - Actionneur avec deux cylindres hydrauliques à simple effet couplés mécaniquement - Google Patents
Actionneur avec deux cylindres hydrauliques à simple effet couplés mécaniquement Download PDFInfo
- Publication number
- EP0271076A2 EP0271076A2 EP87118227A EP87118227A EP0271076A2 EP 0271076 A2 EP0271076 A2 EP 0271076A2 EP 87118227 A EP87118227 A EP 87118227A EP 87118227 A EP87118227 A EP 87118227A EP 0271076 A2 EP0271076 A2 EP 0271076A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- piston
- cylinder
- blocks
- outlet line
- pressure
- 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
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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
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
- F15B11/18—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors used in combination for obtaining stepwise operation of a single controlled member
Definitions
- the invention relates to an actuating device with two mechanically coupled, mutually opposing single-acting hydraulic cylinders, in particular for an implement attached to a vehicle.
- Such actuators are widely known for the actuation of pivoting booms, pivoting beams mounted in the middle or other pivoting components.
- the problem arises of returning the pivotable component, after it has been deflected with the aid of the adjusting device, into a very specific middle position, for example a rest or storage position. This is possible with the known actuating device, but requires special attention from the operator.
- adjusting devices for pivotable components which have an additional operating mode (floating operation) in which the component is freely movable.
- This operating mode is brought about in that the two cylinders are connected to one another by means of an additional valve or an additional switching position of the control valve.
- special skill is required to return the pivotable component from a random position reached in the floating operation to the central position.
- the invention has for its object to propose an actuating device with the help of which the movable component can be easily returned from any position to a certain central position.
- the device should also be of simple construction and easy to assemble.
- a valve depending on the piston position is installed in the cylinders, which blocks a pressure line and a pressure-free outlet line in the middle position of the piston, between the middle position and the retracted end position of the piston connects the pressure line to the cylinder and blocks the outlet line and connects the outlet line to the cylinder and blocks the pressure line between the central position and the extended position of the piston.
- valves By installing the valves in the hydraulic cylinders, advantageously no position sensors or the like need be attached to the pivotable component itself. This is particularly advantageous where this is not possible or unfavorable due to space constraints. Machines, whose pivotable component had previously had to be moved to the central position by hand, can also be converted by replacing the previous cylinders with those with built-in valves.
- a 2-way shut-off valve which either blocks or opens the two lines leading to the valves installed in the cylinders, namely the pressure line and the unpressurized outlet line.
- the locked position the hydraulic fluids are enclosed in the two cylinders so that the respective piston position is maintained.
- the open position hydraulic fluid flows into the cylinder whose piston is retracted further. This piston thus extends in the direction of the central position and the piston of the other cylinder is pushed in by the mechanical coupling via the pivotable component in the direction of the central position.
- the middle position is reached, the connections between the pressure line and the outlet line on the one hand and the cylinder interior on the other hand are blocked by the built-in valves.
- the actuating valve so that it is after a certain time after it has been flipped by the operator or automatically in the open position, automatically goes back to the locked position.
- the described adjusting device is used to pivot the snow blower of a snow groomer back into its central position.
- the snow blower is arranged on a boom, which is pivotably mounted with respect to the snow groomer both in the vertical and in the horizontal plane.
- the snow blower can usually be swiveled freely around the vertical axis of the boom.
- a switching valve automatically open or block the connections of the pressure line to a pressure source and the outlet line to a storage vessel depending on the height of the snow blower.
- the piston of the hydraulic cylinder each have an axial control bore and a control piston projecting into it and provided on the end face in the cylinder.
- This fixed control piston moves in the control bore when the piston of the hydraulic cylinder in question moves.
- the to a hydraulic pump connected pressure line and the outlet line connected to a storage vessel are led to axial channels contained in the control piston, which open near the inner end of the control piston at preferably diametrically opposite positions of the control piston circumference.
- the orifices interact with longitudinal grooves on the inner surface of the control bore, which are staggered in the longitudinal direction and connected to the cylinder interior.
- Each of the two axial channels is assigned to a specific longitudinal groove and this assignment is maintained if, as usual, the installation at the place of use ensures that the cylinder cannot rotate relative to its associated piston. As far as the control piston channels open into their associated longitudinal grooves, there is a connection to the cylinder interior. If the orifices move beyond the longitudinal grooves, the flow is interrupted. In the middle position, this is the case for both channels.
- connection channel which connects the longitudinal groove extending to the inner end of the control bore with the cylinder interior, enables the inflow and outflow of hydraulic oil to the chamber closed by the control piston in the control bore.
- the snow groomer (1) drags a snow blower (2) behind it, which loosens and levels the entire surface of the slope. It can be lifted out of the working position into a rest or transport position indicated by dash-dotted lines in FIG. 1 by means of a boom (3) which is comparable to a trailer drawbar.
- the boom (3) is received in a storage fork (3a), which in turn is pivotally mounted on the chassis of the snow groomer about a vertical axis (4).
- the snow blower (2) can be freely pivoted from both sides by approximately 30 ° from the center position shown in full lines in FIG. 2. This "floating" bearing in milling operation is necessary because the router behaves like a single-axle trailer when cornering. So that the snow blower (2) does not stand at an angle to the longitudinal axis of the vehicle when it is swung up, it must be brought into its central position and held when it is lifted.
- the adjusting device shown in Fig. 3 enables this return to the central position and locking fully automatically when the boom (3) is swung up.
- the two cylinders (5 and 6) are with the bearing fork (3a) of the boom (3) roughly shown schematically in FIG. 3 and the two pistons (7 and 8) movable in the cylinders are on both sides of the pivot axis (4) the chassis of the snow groomer (1) articulated.
- the two pistons (7 and 8) movable in the cylinders are on both sides of the pivot axis (4) the chassis of the snow groomer (1) articulated.
- the two piston / cylinder arrangements are constructed identically, so that the individual description can be limited to one of the two.
- the piston (7) has a central control bore (9) which extends over almost its entire length and is open to the interior of the cylinder.
- a control piston (10) which is permanently connected to the end of the cylinder (5), protrudes into the control bore (9) and can be displaced in it, any necessary sealing means being not taken into account according to the schematic illustration.
- Two channels (11 and 12) run in the control piston (10) and end in the vicinity of the free end of the control piston (10) at two diametrically opposite locations on the outer surface of the control piston.
- openings (13 and 14) interact with two longitudinal grooves (15 and 16) of the control bore (9), which are connected to the interior of the cylinder (5) via connecting channels (17 and 18).
- the longitudinal grooves (15 and 16) are arranged on both sides of the bore center axis and have a common longitudinal center plane.
- the mouths (13 and 14) are also on this level.
- the two longitudinal grooves (15 and 16) are offset from one another in the direction of the bore center axis and leave a short groove-free section of the control bore (9) between them, which is denoted by (19).
- the longitudinal groove (15) thus extends from this section (19) to the inner end of the control bore (9) and the longitudinal groove (16) from the section (19) to the cylinder-side piston end. It is thus achieved that in the central position of the piston (7), when the orifices (13 and 14) are in section (19), the channels (11 and 12) are blocked. Is the piston (7) extended further, like shown, the channel (12) via the groove (16) and the connecting channel (18) is connected to the cylinder interior, while channel (11) is blocked. However, if the piston (7) is located beyond the central position, corresponding to the position of the piston (8) shown, the channel (12) is connected to the interior of the cylinder (5) via the groove (15) and the connecting channel (17) while the channel (12) is blocked.
- the channels (11) of both cylinders are connected to each other by a hydraulic pressure line (20) and connected to a hydraulic pressure source (22) via a 2-way check valve (21).
- the two other channels (12) of both cylinders are connected to one another by an outlet line (23) which leads via the valve (21) to a pressure-free collecting vessel (24).
- the valve (21) is a solenoid valve, which is moved by spring force into the closed position shown and opens both ways when the magnet is excited.
- the two pistons should be able to move freely when the snow blower is operating.
- two further lines (25 and 26) are connected to the two cylinders (5 and 6), which are connected to the collecting vessel (24) via a further magnetically actuated changeover valve (27).
- the lines (25 and 26) are blocked.
- the lines (25 and 26) are connected to one another and to the collecting vessel (24), so that when the two pistons (7 and 8) move in the opposite direction, there is an unimpeded exchange of the hydraulic oil between the cylinders (5 and 6) can.
- the adjusting device automatically operates.
- the magnet of the valve (27) is de-energized and the magnet of the valve (21) is energized.
- the connecting lines (25 and 26) are blocked, pressure is applied to the line (20) and the line (23) is connected to the collecting vessel.
- pressure is now exerted on the cylinder (6) since its channel (11) is connected to the cylinder interior.
- the piston (8) thus moves outwards and swivels the bearing fork (3a) in the direction of its central position.
- the piston (7) moves inwards, whereby the hydraulic oil can flow out of the cylinder (5) via the channel (12) and the outlet line (23).
- the orifices (13 and 14) of the control piston (10) have reached the central section (19) of the control bore (9)
- the solenoid of the valve (21) can be de-energized again so that the floating operating mode is ensured again when the snow blower is started up again and the valve (27) is switched over.
- the return to the middle position naturally also begins in the manner described when the two pistons (7 and 8) are in a different starting position than the one shown.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Pressure Circuits (AREA)
- Fluid-Driven Valves (AREA)
- Forklifts And Lifting Vehicles (AREA)
- Actuator (AREA)
- Vehicle Body Suspensions (AREA)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT87118227T ATE68853T1 (de) | 1986-12-11 | 1987-12-09 | Stellvorrichtung mit zwei mechanisch gekoppelten, einfachwirkenden hydraulikzylindern. |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3642300 | 1986-12-11 | ||
| DE3642300 | 1986-12-11 | ||
| DE3722216 | 1987-07-04 | ||
| DE19873722216 DE3722216A1 (de) | 1986-12-11 | 1987-07-04 | Stellvorrichtung mit zwei mechanisch gekoppelten, einfachwirkenden hydraulikzylindern |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0271076A2 true EP0271076A2 (fr) | 1988-06-15 |
| EP0271076A3 EP0271076A3 (en) | 1989-06-14 |
| EP0271076B1 EP0271076B1 (fr) | 1991-10-23 |
Family
ID=25850221
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP87118227A Expired - Lifetime EP0271076B1 (fr) | 1986-12-11 | 1987-12-09 | Actionneur avec deux cylindres hydrauliques à simple effet couplés mécaniquement |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0271076B1 (fr) |
| AT (1) | ATE68853T1 (fr) |
| DE (2) | DE3722216A1 (fr) |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1056410B (de) * | 1956-09-12 | 1959-04-30 | Stockey & Schmitz | Hydraulische Hubeinrichtung fuer landwirtschaftliche Arbeitsgeraete |
| US2926634A (en) * | 1958-07-18 | 1960-03-01 | Sherman Products Inc | Flow control valve |
| FR1563208A (fr) * | 1968-03-01 | 1969-04-11 | ||
| DE6603749U (de) * | 1968-07-23 | 1969-11-06 | Licentia Gmbh | Pneumatischer oder hydraulischer kolbenantrieb mit einer zwischen seinen endlagen angeordneten mittelstellung |
| US3559536A (en) * | 1968-09-11 | 1971-02-02 | Exxon Production Research Co | Multiposition shaft actuator |
| DE2152461A1 (de) * | 1971-10-21 | 1973-04-26 | Fendt & Co Xaver | Nachlaufwalze |
| US4028820A (en) * | 1975-12-31 | 1977-06-14 | Douglas Dynamics Corporation | Hydraulic system for vehicle mounted snowplow blade |
| US4572315A (en) * | 1984-02-09 | 1986-02-25 | Valley Engineering, Inc. | Power hitch |
| DE3439506C1 (de) * | 1984-10-27 | 1986-03-27 | Ing. Alfred Schmidt Gmbh, 7822 St Blasien | Schneepflug |
| DE8632321U1 (de) * | 1986-12-03 | 1987-01-29 | Karl Kässbohrer Fahrzeugwerke GmbH, 7900 Ulm | Pistenfahrzeug mit Geräteträger |
-
1987
- 1987-07-04 DE DE19873722216 patent/DE3722216A1/de not_active Withdrawn
- 1987-12-09 AT AT87118227T patent/ATE68853T1/de not_active IP Right Cessation
- 1987-12-09 EP EP87118227A patent/EP0271076B1/fr not_active Expired - Lifetime
- 1987-12-09 DE DE8787118227T patent/DE3774088D1/de not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| EP0271076B1 (fr) | 1991-10-23 |
| ATE68853T1 (de) | 1991-11-15 |
| DE3722216A1 (de) | 1988-06-23 |
| EP0271076A3 (en) | 1989-06-14 |
| DE3774088D1 (de) | 1991-11-28 |
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