The present invention relates generally to hydraulic cylinders and more specifically to a hydraulic cylinder assembly system, which allows a hydraulic cylinder to be quickly and efficiently assembled.
U.S. Pat. No. 2,968,864 to Lee discloses an apparatus for assembling resilient seals. Patent publication no. 2014/0215798 to Reece et al. discloses a system and method for installing a seal on a work piece. The hydraulic cylinder assembly is preferably adapted for assembling a Rodder water pump, Model 2100, but could be used to assemble other pumps.
Accordingly, there is a clearly felt need in the art for a hydraulic cylinder assembly system, which allows a hydraulic cylinder to be quickly and efficiently assembled.
The present invention provides a hydraulic cylinder assembly system, which allows a hydraulic cylinder to be quickly and efficiently assembled. The hydraulic cylinder assembly system preferably includes a seal installer tool, a piston puller tool and a barrel ring. The seal installer tool includes a tapered ring and a piston plug. The piston plug extends from a rear of the tapered ring. The tapered ring includes a small diameter and a larger diameter. The small diameter is less than an inner diameter of a piston seal. The large diameter is equal to or larger than an outer diameter of a piston of a hydraulic cylinder. The piston plug is inserted into an inner diameter of the piston, until the tapered ring contacts an end of the piston. A user installs a piston seal on to opposing ends of the piston by gradually pushing and stretching the piston seal on the tapered ring with their hands. The piston seal is pushed unto the piston until it drops into a seal slot in an outer diameter of the piston. The seal installation tool includes a threaded tap. The threaded tap allows the piston plug to be extracted from the piston.
The piston puller tool preferably includes a piston rod engagement member, a thrust bearing retainer, a thrust bearing, a draw rod and a barrel end retainer. The piston rod engagement member includes a thrust retainer thread projection, a base engagement portion and a first rod thread and second rod thread. The thrust retainer thread portion extends from one end of the base engagement portion and the first rod thread extends from an opposing end of the base engagement portion. The second rod thread extends from an end of the first rod thread. A rod bore is formed through the base engagement portion to slidably receive a rotation rod. The rotation rod is axially retained in the rod bore with a set screw threaded into the base portion perpendicular to the rod bore.
The thrust bearing retainer preferably includes a rod hole, a thrust bearing bore and a retainer thread. A rod hole is formed in one end of the thrust bearing retainer and the thrust bearing bore is formed into the thrust bearing retainer, starting at an opposing end. The retainer thread is formed in the opposing end of the thrust bearing retainer. A grease threaded tap is formed perpendicular to the thrust bearing bore to threadably receive a grease zerk for lubricating the thrust bearing. The thrust bearing bore is sized to receive the thrust bearing. A retainer thread tap is formed perpendicular to the retainer thread to threadably receive a retainer set screw. The retainer set screw prevents the retainer thread projection from rotating relative to the thrust bearing retainer.
The draw rod includes a threaded shaft having a preferable one inch diameter, but other diameters may also be used. The thrust bearing is inserted into the thrust bearing bore. Then one end of the draw rod is inserted through the thrust bearing retainer and a thrust nut is threaded on to the one end of the draw rod. A roll pin or the like is inserted through the thrust nut to prevent rotation of the thrust nut relative to the draw rod. The barrel end retainer includes a length that is greater than a diameter of a hydraulic piston barrel. A threaded tap is formed through barrel end retainer to threadably receive an opposing end of the draw rod. A barrel diameter is formed on an end of the barrel end retainer to receive an inner diameter of the hydraulic piston barrel. The barrel end retainer is threaded on to the opposing end of the draw rod. A rotation nut is preferably secured to the opposing end of the draw rod with a second roll pin, welding or any other suitable method.
The barrel ring includes a first half and a second half. A barrel bore is formed in the barrel ring to receive an outer diameter of the hydraulic piston barrel of the hydraulic cylinder. A tapered bore is formed in an opposing end of the barrel ring. The tapered bore includes a large diameter and a small diameter. The large diameter is greater than an outer perimeter of the piston seal. The small diameter of the tapered bore is smaller than an inner diameter of the hydraulic piston barrel. The first half and the second half are attached to each with a plurality of barrel fasteners, but other attachment methods could also be used.
A typical hydraulic cylinder includes a center block, a piston rod, an oil piston, a water piston, an oil barrel, a water barrel, an oil end block, a water end block and a plurality of trust rods. The piston rod is slidably retained in the center block. The oil piston is attached to one end of the piston rod and the water piston is attached to an opposing end of the rod. The oil barrel is slid over the oil piston and into one end of the center block. The water barrel is slid over the water piston and into an opposing end of the center block. The oil end block is secured to the oil barrel and the water end block is secured to the water barrel. The oil and water end blocks are forced against the oil and water barrels with the plurality of trust rods.
In use, the piston seals are assembled to the oil piston as previously described. The piston puller tool is threaded into the piston rod. The rotation nut and the barrel end retainer are removed from the piston puller tool. The piston with piston seals is slid on to the draw rod. The barrel ring is attached to an end of the hydraulic piston barrel. The hydraulic piston barrel is slid over the draw rod. The barrel end retainer and the rotation nut are then reinstalled on the draw rod. The rotation nut is rotated, until the thrust bearing retainer pushes the piston into the hydraulic piston barrel through the barrel ring. The hydraulic piston barrel is pushed into the center block. The process is then repeated for the other piston and hydraulic piston barrel.
Accordingly, it is an object of the present invention to provide a hydraulic cylinder assembly system, which allows a hydraulic cylinder to be quickly and efficiently assembled.
These and additional objects, advantages, features and benefits of the present invention will become apparent from the following specification.
With reference now to the drawings, and particularly to
With reference to
With reference to
The draw rod 32 includes a threaded shaft 64 being preferably one inch in diameter, but other diameters may also be used. The thrust bearing 30 is inserted into the thrust bearing bore 54. Then, one end of the draw rod 32 is inserted through the thrust bearing 30 retainer and a thrust nut 66 is threaded on to the one end of the draw rod 32. A roll pin 68 or the like is inserted through the thrust nut 66 (when the thrust nut 66 is outside the thrust bearing retainer 28) to prevent rotation of the thrust nut 66 relative to the draw rod 32.
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While particular embodiments of the invention have been shown and described, it will be obvious to those skilled in the art that changes and modifications may be made without departing from the invention in its broader aspects, and therefore, the aim in the appended claims is to cover all such changes and modifications as fall within the true spirit and scope of the invention.
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