Hydraulic cylinder with integrated accumulator
a technology of accumulator and hydraulic cylinder, which is applied in the direction of fluid couplings, couplings, mechanical devices, etc., can solve the problems of bulky and awkward conventional hydraulic cylinders falling under category (2), system energy and spatial efficiency suffers, and the length of the cylinder wall is increased, so as to minimize the bulkiness and awkwardness of the hydraulic cylinder assembly, and minimize the risk of shock loading
Inactive Publication Date: 2006-09-21
DEERE & CO
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Benefits of technology
[0005] Described herein is a hydraulic cylinder assembly where the accumulator at least partially surrounds the outer cylindrical wall of the hydraulic cylinder. The particular accumulator described is concentric with the outer wall of the hydraulic cylinder. Thus, it follows that the outer diameter of the accumulator decreases as the length of cylinder wall covered increases. Such an arrangement tends to minimize bulkiness and awkwardness of the hydraulic cylinder assembly as what remains is a hydraulic cylinder with a slightly larger diameter.
[0006] The accumulator described herein includes a piston that tends to slow down as it reaches the end of travel during an extension of the hydraulic cylinder. This feature is a cushioning effect that minimizes the risk of shock loading from the accumulator piston suddenly slamming into an accumulator wall at the end of travel and results from progressive blockage, by the accumulator piston, of flow from the accumulator to the cylinder.
Problems solved by technology
Further, any spatial considerations are amplified as each intervening piece of hydraulic equipment, including the accumulator tends to awkwardly consume space.
For these and other reasons, such systems suffer from the standpoint of energy and spatial efficiency.
Conventional hydraulic cylinders falling under category (2) tend to be bulky and awkward.
The hydraulic lines and valve(s) necessitated in arrangements for hydraulic cylinders under category (1) are often eliminated but the accumulator is usually bulky and awkwardly placed.
The awkwardness of such an arrangement tends to limit its usefulness, particularly on off road vehicles requiring optimal ranges of motion and having limited space available.
Method used
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[0013]FIGS. 1 and 2 are oblique views of an exemplary embodiment of the invention. FIGS. 3, 4 and 5 are schematics of the exemplary embodiment illustrated in FIGS. 1 and 2. The embodiment illustrated is a hydraulic cylinder assembly 100 which includes: a hydraulic cylinder 110 having first, second and third cylinder ports 101, 102 and 104; and a hydraulic accumulator 120 that is concentric with and integral to the hydraulic cylinder 110 having first and second accumulator ports 103 and 105.
[0014] The hydraulic cylinder 110 includes: a piston rod 111; a first longitudinal cylinder wall 112; a second longitudinal cylinder wall 119; a first cylinder end wall portion 113a; a second cylinder end wall portion 114a; a first cylinder port 101; and a second cylinder port 102. The piston rod 111 includes: a cylindrical rod portion 116 having an inner rod diameter A and an outer rod diameter B; a rod end wall 117 enclosing a first end of the cylindrical rod portion 116; and a piston ring disk...
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A hydraulic cylinder assembly includes a hydraulic cylinder and an integral concentric accumulator. The hydraulic cylinder has a first piston surface for extending the cylinder, a second piston surface for retracting the cylinder and a third piston surface in dedicated communication with the accumulator.
Description
FIELD OF THE INVENTION [0001] The invention relates to hydraulic cylinders and, more particularly, relates to hydraulic cylinders with integrated accumulators. Such hydraulic cylinders are normally used in off-road work vehicles, i.e., construction equipment. BACKGROUND OF THE INVENTION [0002] Conventional hydraulic cylinders in hydraulic circuits utilizing hydraulic accumulators come under the following two general categories: (1) stand alone hydraulic cylinders using remote accumulators and (2) hydraulic cylinder assemblies formed by integrating hydraulic cylinders with the accumulators. Addressed herein are hydraulic cylinder assemblies. SUMMARY OF THE INVENTION [0003] Conventional hydraulic cylinders falling under category (1) are separated from the remote accumulators by hydraulic equipment having a resistance to the flow of hydraulic energy. Thus, in such systems, the net amount of energy delivered to the conventional hydraulic cylinder is reduced as the hydraulic fluid flows ...
Claims
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IPC IPC(8): F16D31/02
CPCA01D34/246F15B1/02F15B15/1466F15B2201/31
Inventor HINDMAN, JAHMY JOMONT
Owner DEERE & CO