WO1988003098A1 - Arrangement for a hydraulically operated lifting arrangement - Google Patents
Arrangement for a hydraulically operated lifting arrangement Download PDFInfo
- Publication number
- WO1988003098A1 WO1988003098A1 PCT/SE1987/000485 SE8700485W WO8803098A1 WO 1988003098 A1 WO1988003098 A1 WO 1988003098A1 SE 8700485 W SE8700485 W SE 8700485W WO 8803098 A1 WO8803098 A1 WO 8803098A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pump
- hydraulic
- arrangement
- pressure
- pressure side
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60P—VEHICLES ADAPTED FOR LOAD TRANSPORTATION OR TO TRANSPORT, TO CARRY, OR TO COMPRISE SPECIAL LOADS OR OBJECTS
- B60P1/00—Vehicles predominantly for transporting loads and modified to facilitate loading, consolidating the load, or unloading
- B60P1/44—Vehicles predominantly for transporting loads and modified to facilitate loading, consolidating the load, or unloading having a loading platform thereon raising the load to the level of the load-transporting element
- B60P1/4471—General means for controlling movements of the loading platform, e.g. hydraulic systems
-
- 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
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/02—Installations or systems with accumulators
-
- 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
- F15B21/14—Energy-recuperation means
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/21—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge
- F15B2211/214—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge the pressure sources being hydrotransformers
Definitions
- the present invention relates to an arrangement for a hydraulically operated lifting arrangement, for example a so—called tailgate lift, consisting of at least one cylinder/piston unit for actuating .a lifting platform, which unit is connected via a hand valve to the pressure side of a pump by means of a hydraulic line, which pump communicates on its suction side with a hydraulic tank and on its pressure side with a pressure accumulator.
- a hydraulically operated lifting arrangement for example a so—called tailgate lift, consisting of at least one cylinder/piston unit for actuating .
- a lifting platform which unit is connected via a hand valve to the pressure side of a pump by means of a hydraulic line, which pump communicates on its suction side with a hydraulic tank and on its pressure side with a pressure accumulator.
- a discharged battery also means, of course, that the drive motor cannot be restarted by means of the vehicle starter motor.
- the object of the present invention is to make available an arrangement for a hydraulically operated lifting arrangement, by means of which lifting and lowering operations can be performed at a significantly lower level of energy consumption.
- the manner in which this is made possible in accordance with the invention is for the arrangement to comprise two hydraulic machines acting as a pump/motor and operatively connected via their- shafts and in a
- the designation 8 is used in the drawing in respect of a hydraulically operated cylinder/piston unit with two cylinders, the piston rods of which are operatively connected in a conventional, manner, which is accordingly not represented in detail, to a load-carrying platform for the purpose of lifting and lowering same.
- the piston/cylinder unit 8 is connected via a hand valve 7 to the pressure side of a hydraulic pump 2 by means of a hydraulic line 10, which pump communicates on its suction side with a hydraulic tank 3 via a hydraulic line 11.
- Manual actuation of the lever 12 of the hand valve 7 determines which of the two cylinder/piston units 8 shown in the drawing is to be selected and is to represent tipping or lifting/lowering of the load— arrying platform.
- the pressure side of the pump 2 communicates with a hydraulic accumulator 6 via a line 13 connected to the line 10.
- two reversible hydraulic machines 4, 5 capable of acting as a pump/motor, which machines are operatively connected to one another via their shafts 14.
- the fact that the hydraulic machines are reversible is indicated in the Figure by means of a bi-directional rotating arrow 15.
- the pump/motor machine 5 is connected to the line 10 between the pressure side of the hydraulic pump 2 and the valve 7.
- the pump/motor machine 4 is capable of being regulated, that is to say its displacement can be varied, and is connected in parallel with the hydraulic pump 2 by means of a hydraulic line 16, which is thus connected to the lines 10 and 11.
- a hydraulic machine which is capable of being regulated in this way may, for example, be an axial piston pump/motor, the pressure disc of which has a variable operating angle.
- the hydraulic pump 2 is operatively connected via its shaft 17 with a drive arrangement 1 so arranged as to drive the shaft 17 of the pump round in a direction such as is illustrated with a rotating arrow 18.
- the drive arrangement 1 is, for example, an electric motor supplied with energy from the vehicle battery a hydraulic motor connected in the hydraulic system of the vehicle, or even the drive motor of the vehicle.
- a pressure sensor 9 is connected in the line 10.
- the pressure se sor 9 is so arranged as to cause the pump 2 to operate in order to increase the pressure inside the pressure accumulator 6 when a predetermined first pressure value is .no achieved, and as to stop the pump 2 when a second pressure value has been reached. It is obvious that the latter is greater than the first pressure value.
- actuation takes place from the pressure sensor -9 via a contactor (not illustrated in the drawing) connected between the vehicle battery and the drive arrangement.
- actuation from the pressure sensor 9 can take place via a solenoid valve, or via a coupling (not referred to in more detail) connected on the shaft 17 between the drive arrangement 1 and the hydraulic pump 2.
- the last—mentioned actuation is also applicable in the case in which the hydraulic motor 2 is driven by the main drive engine of the vehicle.
- Hydraulic fluid is pumped with the help of the hydraulic pump 2 from the tank 3 into the pressure accumulator 6 until the pre— etermined pressure is reached. Once this pressure has been reached, the pumping function of the hydraulic motor is stopped by the effect of the pressure sensor 9.
- the hydraulic machine 4 In order to lift a load which has been placed on the load—carrying platform, the hydraulic machine 4 is caused to operate as a motor, in which case hydraulic fluid flows from the pressure accumulator 6, via the lines 10 and 16 to the hydraulic tank 3. This hydraulic flow thus drives the hydraulic machine 4, which in turn, via the shaft 14, drives the hydraulic machine 5 so that a pressure increase is obtained in the line 10 to the cylinder/piston unit 8.
- variable hydraulic machine 4 would be caused to operate as a motor, as described above, driven by a hydraulic flow from the accumulator 6 to the hydraulic tank 3, in which case a pressure increase would be obtained across the hydraulic machine 5, which would now operate as a pump.
- the hydraulic machine 4 acts as a brake for the lowering motion, in which case hydraulic fluid is pumped from the tank 3 into the accumulator 6.
- the rate of lowering can be adjusted accurately in this way by controlling the regulation of the hydraulic machine 4. If the load which is to be lowered is unable to overcome the pressure inside the accumulator 6, the hydraulic machine 4 will be caused to operate as a motor, as described above, driven by a hydraulic flow from the pressure accumulator 6 to the tank 3, thereby causing the hydraulic machine 5 to operate as a pump and to increase the pressure above the value existing inside the pressure accumulator.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Transportation (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Lifting Devices For Agricultural Implements (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
An arrangement for a hydraulically operated lifting arrangement, for example a so-called tail lift, comprising at least one cylinder/piston unit (8) for actuating a lifting platform. This is connected via a hand valve (7) to the pressure side of a pump (2) by means of a hydraulic line (10). The pump (2) communicates on its suction side with a hydraulic tank (3), and on its pressure side with a pressure accumulator (6). A characteristic feature of the invention is that the arrangement comprises two hydraulic machines (4, 5) acting as a pump/motor and operatively connected via their shafts (14) and in a previously disclosed manner. These are reversible, and one of the hydraulic machines (5) is connected to the line (10) between the pressure side (2) of the pump and the valve (7). The other hydraulic machine (4), which is also capable of being regulated, is connected in parallel with the pump (2).
Description
Arrangement for a hydraulically operated lifting arrangement
The present invention relates to an arrangement for a hydraulically operated lifting arrangement, for example a so—called tailgate lift, consisting of at least one cylinder/piston unit for actuating .a lifting platform, which unit is connected via a hand valve to the pressure side of a pump by means of a hydraulic line, which pump communicates on its suction side with a hydraulic tank and on its pressure side with a pressure accumulator.
Many distribution vehicles and similar are now equipped with a tailgate lift in order to facilitate and simplify the loading and unloading of goods. In order to be able to use the lift at those times when the ordinary drive motor of the vehicle, which is more often than not an internal combustion engine, cannot be operated for environmental or safety reasons, the pump in a previously disclosed lift is so arranged as to be driven by an electric motor, the energy supply to which is provided from the vehicle battery. The design of the lift outlined briefly above results in relatively high energy consumption, however, which in turn leads
■ to the interruption of operation due to the battery becoming discharged. A discharged battery also means, of course, that the drive motor cannot be restarted by means of the vehicle starter motor.
A further complicating detail in this respect is the fact that the driving pattern of distribution vehicles involves many and frequent stops, which means that the charging of the batteries is ineffective.
The object of the present invention is to make available an arrangement for a hydraulically operated lifting arrangement, by means of which lifting and lowering operations can be performed at a significantly lower level of energy consumption. The manner in which this is made possible in accordance with the invention is
for the arrangement to comprise two hydraulic machines acting as a pump/motor and operatively connected via their- shafts and in a
„previously disclosed fashion, which machines are reversible, and of which one is connected to the line'between the pressure side of the pimp and the valve, and the other, which is also capable of being regulated, is connected in parallel with the pump. The arrangement in accordance with the invention causes energy to be fed back into the pressure accumulator as a load is lowered. This accumulated energy can be utilized at any time to perform a lifting operation.
The invention is described in greater detail below with reference to the accompanying drawing, which illustrates in schematic form the construction of an arrangement in accordance with the present invention. Omitted from the drawing and from the following specification are those details which are self—evident to an expert, such as throttles, pressure relief valves, and other safety features. In spite -of the fact that the invention is described below in relation to a specific application, in this case a so—called tail lift, it is obvious that the invention must not be regarded as being restricted to this application. τ0n the contrary, the invention is capable of being used in -all those applications in which hydraulics are used for the lifting and lowering of a load, for example in a hydraulic truck.
The designation 8 is used in the drawing in respect of a hydraulically operated cylinder/piston unit with two cylinders, the piston rods of which are operatively connected in a conventional, manner, which is accordingly not represented in detail, to a load-carrying platform for the purpose of lifting and lowering same. The piston/cylinder unit 8 is connected via a hand valve 7 to the pressure side of a hydraulic pump 2 by means of a hydraulic line 10, which pump communicates on its suction side with a hydraulic tank 3 via a hydraulic line 11. Manual actuation of the lever 12 of the hand valve 7 determines which of the two cylinder/piston units 8 shown in the drawing is to be selected and
is to represent tipping or lifting/lowering of the load— arrying platform.
The pressure side of the pump 2 communicates with a hydraulic accumulator 6 via a line 13 connected to the line 10. Also present in accordance with the invention are two reversible hydraulic machines 4, 5 capable of acting as a pump/motor, which machines are operatively connected to one another via their shafts 14. The fact that the hydraulic machines are reversible is indicated in the Figure by means of a bi-directional rotating arrow 15. The pump/motor machine 5 is connected to the line 10 between the pressure side of the hydraulic pump 2 and the valve 7.
The pump/motor machine 4 is capable of being regulated, that is to say its displacement can be varied, and is connected in parallel with the hydraulic pump 2 by means of a hydraulic line 16, which is thus connected to the lines 10 and 11. A hydraulic machine which is capable of being regulated in this way may, for example, be an axial piston pump/motor, the pressure disc of which has a variable operating angle.
The hydraulic pump 2 is operatively connected via its shaft 17 with a drive arrangement 1 so arranged as to drive the shaft 17 of the pump round in a direction such as is illustrated with a rotating arrow 18. The drive arrangement 1 is, for example, an electric motor supplied with energy from the vehicle battery a hydraulic motor connected in the hydraulic system of the vehicle, or even the drive motor of the vehicle.
In order automatically to maintain a certain pressure inside the pressure accumulator 6, a pressure sensor 9 is connected in the line 10. The pressure se sor 9 is so arranged as to cause the pump 2 to operate in order to increase the pressure inside the pressure accumulator 6 when a predetermined first pressure value is .no achieved, and as to stop the pump 2 when a second pressure value has been reached. It is obvious that the latter is greater than the first pressure value.
In the event of the drive arrangement being an electric motor, actuation takes place from the pressure sensor -9 via a contactor (not illustrated in the drawing) connected between the vehicle battery and the drive arrangement. If the drive arrangement 1 is a hydraulic motor connected to the hydraulic system of the vehicle, actuation from the pressure sensor 9 can take place via a solenoid valve, or via a coupling (not referred to in more detail) connected on the shaft 17 between the drive arrangement 1 and the hydraulic pump 2. The last—mentioned actuation is also applicable in the case in which the hydraulic motor 2 is driven by the main drive engine of the vehicle.
What is achieved through the arrangement in accordance with the invention is that at least a part of the potential energy possessed by a load which is to be lowered can be transferred to and stored in the pressure accumulator 6. The arrangement in accordance with the invention operates in the following manner:
Hydraulic fluid is pumped with the help of the hydraulic pump 2 from the tank 3 into the pressure accumulator 6 until the pre— etermined pressure is reached. Once this pressure has been reached, the pumping function of the hydraulic motor is stopped by the effect of the pressure sensor 9. In order to lift a load which has been placed on the load—carrying platform, the hydraulic machine 4 is caused to operate as a motor, in which case hydraulic fluid flows from the pressure accumulator 6, via the lines 10 and 16 to the hydraulic tank 3. This hydraulic flow thus drives the hydraulic machine 4, which in turn, via the shaft 14, drives the hydraulic machine 5 so that a pressure increase is obtained in the line 10 to the cylinder/piston unit 8. If the load were to be small, and if the rate of lifting were to be too great, the lifting movement would be braked by the hydraulic machine 5 being caused to operate as a pump, in which case hydraulic fluid is pumped from the hydraulic tank 3 to the accumulator 6. Effective and accurate regulation of the rate of lifting is achieved in this way. This regulation is associated with relatively speaking very
small losses. In the event of the load which is to be lowered balancing the pressure inside the accumulator- 6, the hydraulic machine 4 is re—set to its neutral position, and the hydraulic flow can pass through the hydraulic machine 5 with minimal losses. If the weight of the load were to be such as to exceed the pressure inside the accumulator, then the variable hydraulic machine 4 would be caused to operate as a motor, as described above, driven by a hydraulic flow from the accumulator 6 to the hydraulic tank 3, in which case a pressure increase would be obtained across the hydraulic machine 5, which would now operate as a pump.
When a load ' which is heavier than the pressure 1 inside the accumulator 6 is lowered, the hydraulic machine 4 acts as a brake for the lowering motion, in which case hydraulic fluid is pumped from the tank 3 into the accumulator 6. The rate of lowering can be adjusted accurately in this way by controlling the regulation of the hydraulic machine 4. If the load which is to be lowered is unable to overcome the pressure inside the accumulator 6, the hydraulic machine 4 will be caused to operate as a motor, as described above, driven by a hydraulic flow from the pressure accumulator 6 to the tank 3, thereby causing the hydraulic machine 5 to operate as a pump and to increase the pressure above the value existing inside the pressure accumulator. Accordingly, it is the regulation of the hydraulic machine 4 in such a way as to cause it to act as a pump or as a motor which indicates the direction of movement of the piston of the cylinder/piston unit 8, that is to say which determines whether the cylinder/piston unit 8 will describe a lifting movement or a lowering movement.
Claims
Pa tent C l a i m
Arrangement for a hydraulically operated lifting arrangement, for example a so—called tail lift, comprising at least one cylinder/ piston unit C8) for actuating a lifting platform, which unit is connected via a hand valve (7) to the pressure side of a pump (2) by means of a hydraulic line C10), which pump communicates on its suction side with a hydraulic tank (3), and on its pressure side with a pressure accumulator (6), c h a r a c t e r i z e d in that the arrangement comprises two hydraulic machines (4, 5) acting as a pump/motor and operatively connected via their shafts (14) and in a previously disclosed fashion, which machines are reversible, and of which one (5) is connected to the line (10) between the pressure side of the pump (2) and the valve (7), and the other (4), which is also capable of being regulated, is connected in parallel with the pump (2).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE8604678-6 | 1986-10-31 | ||
SE8604678A SE455853B (en) | 1986-10-31 | 1986-10-31 | DEVICE FOR A HYDRAULIC WORKING EQUIPMENT FOR ENERGY RECOVERY |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1988003098A1 true WO1988003098A1 (en) | 1988-05-05 |
Family
ID=20366153
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SE1987/000485 WO1988003098A1 (en) | 1986-10-31 | 1987-10-20 | Arrangement for a hydraulically operated lifting arrangement |
Country Status (2)
Country | Link |
---|---|
SE (1) | SE455853B (en) |
WO (1) | WO1988003098A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2008057289A1 (en) * | 2006-11-08 | 2008-05-15 | Caterpillar Inc. | Bidirectional hydraulic transformer |
CN106678098A (en) * | 2016-12-30 | 2017-05-17 | 徐州重型机械有限公司 | Crane hydraulic control system and crane |
US20220242298A1 (en) * | 2021-01-29 | 2022-08-04 | Hiab USA Inc. | Vehicle and method with energy recovery lift gate |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4026107A (en) * | 1974-11-23 | 1977-05-31 | Osrodek Badawczo-Rozwojowy Przemyslu Budowy Urzaszen Chemicznych "Cebea" | Electrohydraulic press drive system |
WO1984003127A1 (en) * | 1983-02-03 | 1984-08-16 | Goeran Palmers | A device in hydraulically driven machines |
US4495768A (en) * | 1982-03-12 | 1985-01-29 | Inventors Compendium International Corp. | Hydrostatic transmissions |
US4553391A (en) * | 1982-11-30 | 1985-11-19 | Mannesmann Rexroth Gmbh | Control device for a hydraulic cylinder for maintaining the pulling force thereof constant |
-
1986
- 1986-10-31 SE SE8604678A patent/SE455853B/en not_active IP Right Cessation
-
1987
- 1987-10-20 WO PCT/SE1987/000485 patent/WO1988003098A1/en unknown
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4026107A (en) * | 1974-11-23 | 1977-05-31 | Osrodek Badawczo-Rozwojowy Przemyslu Budowy Urzaszen Chemicznych "Cebea" | Electrohydraulic press drive system |
US4495768A (en) * | 1982-03-12 | 1985-01-29 | Inventors Compendium International Corp. | Hydrostatic transmissions |
US4553391A (en) * | 1982-11-30 | 1985-11-19 | Mannesmann Rexroth Gmbh | Control device for a hydraulic cylinder for maintaining the pulling force thereof constant |
WO1984003127A1 (en) * | 1983-02-03 | 1984-08-16 | Goeran Palmers | A device in hydraulically driven machines |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2008057289A1 (en) * | 2006-11-08 | 2008-05-15 | Caterpillar Inc. | Bidirectional hydraulic transformer |
US7775040B2 (en) | 2006-11-08 | 2010-08-17 | Caterpillar Inc | Bidirectional hydraulic transformer |
CN106678098A (en) * | 2016-12-30 | 2017-05-17 | 徐州重型机械有限公司 | Crane hydraulic control system and crane |
US20220242298A1 (en) * | 2021-01-29 | 2022-08-04 | Hiab USA Inc. | Vehicle and method with energy recovery lift gate |
US11970102B2 (en) * | 2021-01-29 | 2024-04-30 | Hiab USA Inc. | Vehicle and method with energy recovery lift gate |
Also Published As
Publication number | Publication date |
---|---|
SE8604678L (en) | 1988-05-01 |
SE455853B (en) | 1988-08-15 |
SE8604678D0 (en) | 1986-10-31 |
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