CA2453074A1 - Pressurized gas assisted hydraulic amplifier for a hydraulic lifting assembly - Google Patents
Pressurized gas assisted hydraulic amplifier for a hydraulic lifting assembly Download PDFInfo
- Publication number
- CA2453074A1 CA2453074A1 CA 2453074 CA2453074A CA2453074A1 CA 2453074 A1 CA2453074 A1 CA 2453074A1 CA 2453074 CA2453074 CA 2453074 CA 2453074 A CA2453074 A CA 2453074A CA 2453074 A1 CA2453074 A1 CA 2453074A1
- Authority
- CA
- Canada
- Prior art keywords
- compartment
- slave
- hydraulic
- lifting assembly
- cylinder
- 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.)
- Abandoned
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
- F15B3/00—Intensifiers or fluid-pressure converters, e.g. pressure exchangers; Conveying pressure from one fluid system to another, without contact between the fluids
-
- 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
- F15B11/06—Servomotor systems without provision for follow-up action; Circuits therefor involving features specific to the use of a compressible medium, e.g. air, steam
- F15B11/072—Combined pneumatic-hydraulic systems
- F15B11/0725—Combined pneumatic-hydraulic systems with the driving energy being derived from a pneumatic system, a subsequent hydraulic system displacing or controlling the output element
-
- 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
- F15B2211/205—Systems with pumps
- F15B2211/2053—Type of pump
-
- 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
- F15B2211/212—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge the pressure sources being 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
- 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
- F15B2211/216—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge the pressure sources being pneumatic-to-hydraulic converters
-
- 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
- F15B2211/30—Directional control
- F15B2211/305—Directional control characterised by the type of valves
- F15B2211/30525—Directional control valves, e.g. 4/3-directional control valve
-
- 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
- F15B2211/60—Circuit components or control therefor
- F15B2211/625—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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/80—Other types of control related to particular problems or conditions
- F15B2211/88—Control measures for saving energy
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)
- Fluid-Pressure Circuits (AREA)
Abstract
A pressurized gas assisted hydraulic amplifier for a hydraulic lifting assembly, when the hydraulic lifting assembly is lowered a master piston moves causing a slave piston to compress a gaseous medium. This results in a gas pressure build up within a second compartment of the slave cylinder and an associated gaseous medium accumulator. When raising the hydraulic lifting assembly, the expansion of gaseous medium in the second compartment of the slave cylinder provides a supplemental lifting force which is exerted upon the slave piston and transferred to the master piston.
Description
TITLE OF THE INVENTIONS
Pressurized gas assisted hydraulic amplifier for a hydraulic lifting assembly FIELD OF THE INVENTION
The present invention relates to the use of pressurized gas assisted hydraulic amplifier to assist in lifting a hydraulic lifting assembly, which may include a boom, a hoist, or an excavator bucket.
BACKGROOND OF THE INVENTION
There is a marked difference in the amount of energy required to raise a hydraulic boom, as compared to the energy required to lower the hydraulic boom. When raising the hydraulic boom, hydraulic fluid is fighting against the weight of the boom and any load that the boom supports. In contrast, whenever a hydraulically powered boom is lowered, gravity and inertia act to assist with the lowering of the boom. In fact, hydraulic fluid from the boom's hydraulic cylinders must be passed through a restriction to slow the boom down. This takes the kinetic energy of the boom and dissipates it as heat.
SUNN'P~RY OF THE INVENTION
What is required is a way of capturing the excess kinetic energy generated when lowering a hydraulic lifting assembly, so it can be used to assist in raising the hydraulic lifting assembly.
According to the present invention there is provided a pressurized gas assisted hydraulic amplifier for a hydraulic lifting assembly. A master cylinder is provided, along with a slave cylinder in axial alignment with the master cylinder.
The slave cylinder has a smaller internal diameter than the master cylinder. A master piston is disposed in the master cylinder. The master piston divides the master cylinder into a first compartment and a second compartment. A slave piston is disposed in the slave cylinder. The slave piston is tied to the master cylinder by a shaft, such that movement of the master piston results in movement of the slave piston. The slave piston divides the slave cylinder into a first compartment and a second compartment. A source of pressurized hydraulic fluid is in fluid communication with the second compartment of the master cylinder. A gaseous medium accumulator is in fluid communication with the second compartment of the slave cylinder. Then lowering the hydraulic lifting assembly, fluid is expelled from the hydraulic lifting assembly. This expands the first compartment of the master cylinder by moving the master piston. The slave piston moves with the master piston. Movement of the slave piston compresses the gaseous medium, resulting in a gas pressure build up within the second compartment o:E the slave cylinder and the gaseous medium accumulator. When raising the hydraulic lifting assembly, the master piston is moved and the second compartment of the master cylinder is expanded by incoming hydraulic fluid from the source of pressurized hydraulic fluid. Movement of the master piston contracts the first compartment of the master cylinder to force hydraulic fluid from the first compartment of master cy7_inder into the hydraulic lifting assembly. The expansion of gaseous medium in the second compartment of the slave cylinder, concurrently exerts a supplemental force upon the slave piston_ BRIEF DESCRIPTION OF TFiE DRAVaINGS
These and other features of the invention will become more apparent from the following description in which reference is made to the appended drawings, the drawings are for the purpose of illustration only and are not intended to in any way limit the scope of the invention to the particular embodiment or embodiments shown, wherein:
FIGURE 1 is a side elevation view, in section, of a pressurized gas assisted hydraulic amplifier for a hydraulic lifting assembly constructed in accordance with the teachings of the present invention.
FIGURE 2 is a detailed side elevation view, in section, of the hydraulic amplifier illustrated in FIGURE 1, with master and slave pistons in a first position.
FIGURE 3 is a detailed side elevation view, in section, of the hydraulic amplifier illustrated in FIGURE 1, with master and slave pistons in a second position.
FIGURE 4 is a detailed side elevation view, in section, of the hydraulic amplifier illustrated in FIGURE 1, with master and slave pistons in a third position.
FIGURE 5 is a detailed side elevation view, in section, of the hydraulic amplifier illustrated in FIGURE l, with master and slave pistons in a fourth position.
FIGURE 6 is a detailed side elevation view, in section, of an alternative embodiment of the hydraulic amplifier.
DETAILED DESCRIPTION OF THE PREFERRED E1~ODIMENT
A preferred embodiment of pressurized gas assisted hydraulic amplifier for a hydraulic lifting assembly will now be described with reference to FIGURES 1 through 5.
Structure and Relationship of Parts:
Referring to FIGURE 2, there is lifting a mobile lifting apparatus 10. Lifting apparatus has a hydraulic lifting assembly 14 adapted to raise and lower boom 12. Although a boom 12 is illustrated, it will be appreciated that hydraulic lifting assembly 14 may also include an excavator bucket, a hoist or take some other form. A master cylinder 16 and a slave cylinder 18 are provided. Referring to FIGURES 2 through 5, slave cylinder 18 has a smaller internal diameter than master cylinder 16 and is in axial alignment with master cylinder 16. A master piston 20 is disposed in master cylinder 16, dividing master cylinder 16 into a first compartment 22 and a second compartment 24. A slave piston 26 is disposed in slave cylinder 18, dividing slave cylinder 18 into a first compartment 28 and a second compartment 30.
Slave piston 26 is tied to master piston 20 by a shaft 32 such that movement of master piston 20 results in movement of slave piston 26. Referring to FIGURE 1, a source of pressurized hydraulic fluid in the form of hydraulic pump 34 is in fluid communication 36 with second compartment 24 of master cylinder 16 and hydraulic lifting assembly 14. In the illustrated embodiment, a pump 34 is connected via a valve body 38. A
hydraulic connection 40 is provided between hydraulic lifting assembly 14 and first compartment 22 of master cylinder 16. A
gaseous medium accumulator 42 is in fluid communication with second compartment 30 of slave cylinder 18. A hydraulic connection 44 is provided between hydraulic lifting assembly 14 and first compartment 28 of slave cylinder 18.
Operation:
The use and operation of lift boom 10 will now be discussed with reference to FIGURES 1 through 5. Referring to FIGURE l, when lowering boom 12, hydraulic fluid is expelled from hydraulic lifting assembly 14, expanding first compartment 22 of master cylinder 16 and causing master piston to move and expanding first compartment 28 of slave cylinder 18. Referring to FIGURES 2 to 3, the expansion of first compartment 28 of slave cylinder 18 and the movement of slave piston 26 from a first position to a second position compresses the gaseous medium, resulting in a gas pressure build up within second compartment 30 of slave cylinder 18 and gaseous medium accumulator 42. Referring to FIGURE 1, when raising the boom, second compartment 24 cf master cylinder 16 is expanded by incoming hydraulic fluid from source of pressurized hydraulic. fluid 34. Referring to FIGURES 4 to 5, the contraction of first compartment 22 of master cylinder 16 and the movement of master piston 20 from a third position to a fourth position forces hydraulic fluid from first compartment 22 of master cylinder 16 into hydraulic lifting assembly 14. The expansion of gaseous medium in second compartment 30 of slave cylinder 18 acts upon slave piston 26.
This concurrently contracts first compartment 28 of slave cylinder 18, forcing hydraulic fluid from first compartment 28 of slave cylinder into hydraulic lifting assembly 14. It also applies a supplemental lifting force which acts upon slave piston 26 and is transmitted via shaft 32 to master piston 20.
Variations:
In the primary embodiment, hydraulic connection 44 is 5 provided between hydraulic lifting assembly 14 and first compartment 28 of slave cylinder 18. However, this need not be the case. Referring to FTGURE 6, hydraulic. connection 44 may be open to the atmosphere or connected to a supplemental low pressure reservoir, such that first compartment 28 of slave cylinder 18 is open either to the atmosphere, or released to a supplemental low pressure reservoir, which ever may be the case.
In this patent document, the word "comprising" is used in its non-limiting sense to mean that items following the word are included, but items not specifically mentioned are not excluded. A reference to an element by the indefinite article "a" does not exclude the possibility that more than one of the element is present, unless the context clearly requires that there be one and only one of the elements.
It will be apparent to one skilled in the art that modifications may be made to the illustrated embodiment without departing from the spirit and scope of the invention as hereinafter defined in the Claims.
Pressurized gas assisted hydraulic amplifier for a hydraulic lifting assembly FIELD OF THE INVENTION
The present invention relates to the use of pressurized gas assisted hydraulic amplifier to assist in lifting a hydraulic lifting assembly, which may include a boom, a hoist, or an excavator bucket.
BACKGROOND OF THE INVENTION
There is a marked difference in the amount of energy required to raise a hydraulic boom, as compared to the energy required to lower the hydraulic boom. When raising the hydraulic boom, hydraulic fluid is fighting against the weight of the boom and any load that the boom supports. In contrast, whenever a hydraulically powered boom is lowered, gravity and inertia act to assist with the lowering of the boom. In fact, hydraulic fluid from the boom's hydraulic cylinders must be passed through a restriction to slow the boom down. This takes the kinetic energy of the boom and dissipates it as heat.
SUNN'P~RY OF THE INVENTION
What is required is a way of capturing the excess kinetic energy generated when lowering a hydraulic lifting assembly, so it can be used to assist in raising the hydraulic lifting assembly.
According to the present invention there is provided a pressurized gas assisted hydraulic amplifier for a hydraulic lifting assembly. A master cylinder is provided, along with a slave cylinder in axial alignment with the master cylinder.
The slave cylinder has a smaller internal diameter than the master cylinder. A master piston is disposed in the master cylinder. The master piston divides the master cylinder into a first compartment and a second compartment. A slave piston is disposed in the slave cylinder. The slave piston is tied to the master cylinder by a shaft, such that movement of the master piston results in movement of the slave piston. The slave piston divides the slave cylinder into a first compartment and a second compartment. A source of pressurized hydraulic fluid is in fluid communication with the second compartment of the master cylinder. A gaseous medium accumulator is in fluid communication with the second compartment of the slave cylinder. Then lowering the hydraulic lifting assembly, fluid is expelled from the hydraulic lifting assembly. This expands the first compartment of the master cylinder by moving the master piston. The slave piston moves with the master piston. Movement of the slave piston compresses the gaseous medium, resulting in a gas pressure build up within the second compartment o:E the slave cylinder and the gaseous medium accumulator. When raising the hydraulic lifting assembly, the master piston is moved and the second compartment of the master cylinder is expanded by incoming hydraulic fluid from the source of pressurized hydraulic fluid. Movement of the master piston contracts the first compartment of the master cylinder to force hydraulic fluid from the first compartment of master cy7_inder into the hydraulic lifting assembly. The expansion of gaseous medium in the second compartment of the slave cylinder, concurrently exerts a supplemental force upon the slave piston_ BRIEF DESCRIPTION OF TFiE DRAVaINGS
These and other features of the invention will become more apparent from the following description in which reference is made to the appended drawings, the drawings are for the purpose of illustration only and are not intended to in any way limit the scope of the invention to the particular embodiment or embodiments shown, wherein:
FIGURE 1 is a side elevation view, in section, of a pressurized gas assisted hydraulic amplifier for a hydraulic lifting assembly constructed in accordance with the teachings of the present invention.
FIGURE 2 is a detailed side elevation view, in section, of the hydraulic amplifier illustrated in FIGURE 1, with master and slave pistons in a first position.
FIGURE 3 is a detailed side elevation view, in section, of the hydraulic amplifier illustrated in FIGURE 1, with master and slave pistons in a second position.
FIGURE 4 is a detailed side elevation view, in section, of the hydraulic amplifier illustrated in FIGURE 1, with master and slave pistons in a third position.
FIGURE 5 is a detailed side elevation view, in section, of the hydraulic amplifier illustrated in FIGURE l, with master and slave pistons in a fourth position.
FIGURE 6 is a detailed side elevation view, in section, of an alternative embodiment of the hydraulic amplifier.
DETAILED DESCRIPTION OF THE PREFERRED E1~ODIMENT
A preferred embodiment of pressurized gas assisted hydraulic amplifier for a hydraulic lifting assembly will now be described with reference to FIGURES 1 through 5.
Structure and Relationship of Parts:
Referring to FIGURE 2, there is lifting a mobile lifting apparatus 10. Lifting apparatus has a hydraulic lifting assembly 14 adapted to raise and lower boom 12. Although a boom 12 is illustrated, it will be appreciated that hydraulic lifting assembly 14 may also include an excavator bucket, a hoist or take some other form. A master cylinder 16 and a slave cylinder 18 are provided. Referring to FIGURES 2 through 5, slave cylinder 18 has a smaller internal diameter than master cylinder 16 and is in axial alignment with master cylinder 16. A master piston 20 is disposed in master cylinder 16, dividing master cylinder 16 into a first compartment 22 and a second compartment 24. A slave piston 26 is disposed in slave cylinder 18, dividing slave cylinder 18 into a first compartment 28 and a second compartment 30.
Slave piston 26 is tied to master piston 20 by a shaft 32 such that movement of master piston 20 results in movement of slave piston 26. Referring to FIGURE 1, a source of pressurized hydraulic fluid in the form of hydraulic pump 34 is in fluid communication 36 with second compartment 24 of master cylinder 16 and hydraulic lifting assembly 14. In the illustrated embodiment, a pump 34 is connected via a valve body 38. A
hydraulic connection 40 is provided between hydraulic lifting assembly 14 and first compartment 22 of master cylinder 16. A
gaseous medium accumulator 42 is in fluid communication with second compartment 30 of slave cylinder 18. A hydraulic connection 44 is provided between hydraulic lifting assembly 14 and first compartment 28 of slave cylinder 18.
Operation:
The use and operation of lift boom 10 will now be discussed with reference to FIGURES 1 through 5. Referring to FIGURE l, when lowering boom 12, hydraulic fluid is expelled from hydraulic lifting assembly 14, expanding first compartment 22 of master cylinder 16 and causing master piston to move and expanding first compartment 28 of slave cylinder 18. Referring to FIGURES 2 to 3, the expansion of first compartment 28 of slave cylinder 18 and the movement of slave piston 26 from a first position to a second position compresses the gaseous medium, resulting in a gas pressure build up within second compartment 30 of slave cylinder 18 and gaseous medium accumulator 42. Referring to FIGURE 1, when raising the boom, second compartment 24 cf master cylinder 16 is expanded by incoming hydraulic fluid from source of pressurized hydraulic. fluid 34. Referring to FIGURES 4 to 5, the contraction of first compartment 22 of master cylinder 16 and the movement of master piston 20 from a third position to a fourth position forces hydraulic fluid from first compartment 22 of master cylinder 16 into hydraulic lifting assembly 14. The expansion of gaseous medium in second compartment 30 of slave cylinder 18 acts upon slave piston 26.
This concurrently contracts first compartment 28 of slave cylinder 18, forcing hydraulic fluid from first compartment 28 of slave cylinder into hydraulic lifting assembly 14. It also applies a supplemental lifting force which acts upon slave piston 26 and is transmitted via shaft 32 to master piston 20.
Variations:
In the primary embodiment, hydraulic connection 44 is 5 provided between hydraulic lifting assembly 14 and first compartment 28 of slave cylinder 18. However, this need not be the case. Referring to FTGURE 6, hydraulic. connection 44 may be open to the atmosphere or connected to a supplemental low pressure reservoir, such that first compartment 28 of slave cylinder 18 is open either to the atmosphere, or released to a supplemental low pressure reservoir, which ever may be the case.
In this patent document, the word "comprising" is used in its non-limiting sense to mean that items following the word are included, but items not specifically mentioned are not excluded. A reference to an element by the indefinite article "a" does not exclude the possibility that more than one of the element is present, unless the context clearly requires that there be one and only one of the elements.
It will be apparent to one skilled in the art that modifications may be made to the illustrated embodiment without departing from the spirit and scope of the invention as hereinafter defined in the Claims.
Claims (2)
1. A pressurized gas assisted hydraulic amplifier for a hydraulic lifting assembly, comprising:
an hydraulic lifting assembly which has a raises position and lowered position;
a master cylinder;
a slave cylinder in axial alignment with the master cylinder, the slave cylinder having a smaller internal diameter than the master cylinder;
a master piston disposed in the master cylinder, the master piston dividing the master cylinder into a first compartment and a second compartment;
a slave piston disposed in the slave cylinder, the slave piston being tied to the master cylinder by a shaft, such that movement of the master piston results in movement of the slave piston, the slave piston dividing the slave cylinder into a first compartment and a second compartment;
a source of pressurized hydraulic fluid in fluid communication with the second compartment of the master cylinder;
a hydraulic connection between the hydraulic lifting assembly and the first compartment of the master cylinder;
a gaseous medium accumulator in fluid communication with the second compartment of the slave cylinder;
such that when lowering the hydraulic lifting assembly, fluid is expelled from the hydraulic lifting assembly, expanding the first compartment of the master cylinder and causing the slave piston to move with the master piston movement o the slave piston compressing the gaseous medium resulting in a gas pressure build up within the second compartment of the slave cylinder and the gaseous medium accumulator;
such that when raising the hydraulic lifting assembly, the master piston is moved and the second compartment of the master cylinder is expanded by incoming hydraulic fluid from the source of pressurized hydraulic fluid, with movement of the master piston contracting the first compartment of the master cylinder to force hydraulic fluid from the first compartment of master cylinder into the hydraulic lifting assembly, and the expansion of gaseous medium in the second compartment of the slave cylinder concurrently exerting a supplemental force upon the slave piston.
an hydraulic lifting assembly which has a raises position and lowered position;
a master cylinder;
a slave cylinder in axial alignment with the master cylinder, the slave cylinder having a smaller internal diameter than the master cylinder;
a master piston disposed in the master cylinder, the master piston dividing the master cylinder into a first compartment and a second compartment;
a slave piston disposed in the slave cylinder, the slave piston being tied to the master cylinder by a shaft, such that movement of the master piston results in movement of the slave piston, the slave piston dividing the slave cylinder into a first compartment and a second compartment;
a source of pressurized hydraulic fluid in fluid communication with the second compartment of the master cylinder;
a hydraulic connection between the hydraulic lifting assembly and the first compartment of the master cylinder;
a gaseous medium accumulator in fluid communication with the second compartment of the slave cylinder;
such that when lowering the hydraulic lifting assembly, fluid is expelled from the hydraulic lifting assembly, expanding the first compartment of the master cylinder and causing the slave piston to move with the master piston movement o the slave piston compressing the gaseous medium resulting in a gas pressure build up within the second compartment of the slave cylinder and the gaseous medium accumulator;
such that when raising the hydraulic lifting assembly, the master piston is moved and the second compartment of the master cylinder is expanded by incoming hydraulic fluid from the source of pressurized hydraulic fluid, with movement of the master piston contracting the first compartment of the master cylinder to force hydraulic fluid from the first compartment of master cylinder into the hydraulic lifting assembly, and the expansion of gaseous medium in the second compartment of the slave cylinder concurrently exerting a supplemental force upon the slave piston.
2. The pressurized gas assisted hydraulic amplifier as defined in Claim 1, wherein a hydraulic connection is provided between the hydraulic lifting assembly and the first compartment of the slave cylinder, such that when lowering the hydraulic lifting assembly, hydraulic fluid is expelled from the hydraulic lifting assembly into the first compartment of the slave cylinder as it expands with movement of the slave piston and when the slave, when raising the hydraulic lifting assembly, the movement of the slave piston contracts the first compartment forcing hydraulic fluid from the first compartment of the slave cylinder into the hydraulic lifting assembly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2453074 CA2453074A1 (en) | 2004-01-19 | 2004-01-19 | Pressurized gas assisted hydraulic amplifier for a hydraulic lifting assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2453074 CA2453074A1 (en) | 2004-01-19 | 2004-01-19 | Pressurized gas assisted hydraulic amplifier for a hydraulic lifting assembly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2453074A1 true CA2453074A1 (en) | 2005-07-19 |
Family
ID=34744367
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2453074 Abandoned CA2453074A1 (en) | 2004-01-19 | 2004-01-19 | Pressurized gas assisted hydraulic amplifier for a hydraulic lifting assembly |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2453074A1 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2298050A1 (en) * | 2006-08-01 | 2008-05-01 | Edesdev S.L. | Method for recovering pressure machines in working with heated compressed gases, involves applying or releasing pressure in tire to govern operation of external device such as power generator |
| WO2010049594A1 (en) * | 2008-10-30 | 2010-05-06 | Mantsinen Group Ltd Oy | Method and arrangement for the storing of energy |
| EP2580439A1 (en) * | 2010-06-09 | 2013-04-17 | Robert Bosch GmbH | Pressure equalization device for hydraulic systems |
| WO2013164072A1 (en) * | 2012-05-03 | 2013-11-07 | Hydac Technology Gmbh | Device for saving energy in working appliances that can be actuated hydraulically |
| GB2506652A (en) * | 2012-10-05 | 2014-04-09 | Casu Vasu As | An energy storage system and a method of storing energy |
-
2004
- 2004-01-19 CA CA 2453074 patent/CA2453074A1/en not_active Abandoned
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2298050A1 (en) * | 2006-08-01 | 2008-05-01 | Edesdev S.L. | Method for recovering pressure machines in working with heated compressed gases, involves applying or releasing pressure in tire to govern operation of external device such as power generator |
| WO2010049594A1 (en) * | 2008-10-30 | 2010-05-06 | Mantsinen Group Ltd Oy | Method and arrangement for the storing of energy |
| EP2580439A1 (en) * | 2010-06-09 | 2013-04-17 | Robert Bosch GmbH | Pressure equalization device for hydraulic systems |
| WO2013164072A1 (en) * | 2012-05-03 | 2013-11-07 | Hydac Technology Gmbh | Device for saving energy in working appliances that can be actuated hydraulically |
| GB2506652A (en) * | 2012-10-05 | 2014-04-09 | Casu Vasu As | An energy storage system and a method of storing energy |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6918247B1 (en) | Assisted hydraulic system for moving a structural member | |
| JP5997466B2 (en) | Multistage hydraulic cylinder assembly | |
| WO2010141405A4 (en) | Hydraulic oilfield lift pump | |
| CA2531202A1 (en) | Pumping water from a natural gas well | |
| RU2544255C2 (en) | Compressible stopper for use in lift crane and crane fitted with it | |
| WO2006039262A3 (en) | Closed-system electrohydraulic actuator | |
| WO2004081377A3 (en) | Actuator having external load supporting member | |
| RU2011146570A (en) | WORKING DEVICE | |
| CN102518606B8 (en) | Lifting system and lifting method for crane boom of working machine and working machine | |
| JP2012002272A (en) | Hydraulic cylinder and hydraulic drive unit | |
| CN203591540U (en) | Miniature portable hydraulic spreader | |
| US10830258B2 (en) | Device for the direct recovery of hydraulic energy by means of a single-acting hydraulic cylinder | |
| CA2453074A1 (en) | Pressurized gas assisted hydraulic amplifier for a hydraulic lifting assembly | |
| WO2015190972A1 (en) | Hydraulic cylinder | |
| CN204234530U (en) | Portable band steel hydraulic bending machine | |
| CA2442224C (en) | A combination of a chamber and a piston, a pump, a motor, a shock absorber and a transducer incorporating the combination | |
| US10533585B2 (en) | Telescopic device and method for operating a telescopic device | |
| US9127736B2 (en) | Working device | |
| US7171807B2 (en) | Oil circuitry for two-stage telescoping transmission jack | |
| JP6958973B2 (en) | Lifting device for picking up members from the seabed | |
| AU2017204054B2 (en) | Device for recovering hydraulic energy by connecting two differential cylinders | |
| US20140158962A1 (en) | Hydraulic pumping cylinder and method of pumping hydraulic fluid | |
| CN110878741B (en) | Novel adjustable manual pump | |
| US9617129B2 (en) | Hydraulic pumping cylinder and method of pumping hydraulic fluid | |
| JP2006322480A (en) | Assisted hydraulic system for transferring structural member |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |