Metal working – Method of mechanical manufacture – With testing or indicating
Reexamination Certificate
2000-06-29
2002-04-09
Bryant, David P. (Department: 3726)
Metal working
Method of mechanical manufacture
With testing or indicating
C029S407050, C029S407090, C029S464000, C029S888044, C269S071000
Reexamination Certificate
active
06367141
ABSTRACT:
TECHNICAL FIELD
This invention relates generally to a method of inserting a piston assembly into a cylinder of an internal combustion engine, and more particularly to a method of inserting a piston assembly into a cylinder of an internal combustion engine using a piston inserting machine.
BACKGROUND ART
Internal combustion engines are complex mechanisms which include a vast array of components that need to be assembled in a very precise manner. The proper assembly of the components of the internal combustion engine is of the utmost importance since it ensures that the engine will work within its intended design parameters, i.e., in the most efficient manner.
The assembly of these components is both time consuming and arduous, even for the most experienced technician. This is mainly due to the fact that the technician manually performs many of the assembly steps, even those steps which require lifting heavy and awkward components such as piston assemblies. These steps are performed manually despite the fact that they lead to higher manufacturing and production costs.
By way of example, the internal combustion engine may include many components such as cylinder liners, piston assemblies, crankshafts, camshafts, valves and the like. In order to correctly assemble all of these components, the technician typically performs several assembly steps on both the engine block as well as many of the engine components. These steps may include lining the cylinders with cylinder liners and then assembling a piston assembly. The piston assembly typically includes connecting a connecting rod to the piston (via a pin) and placing rings within grooves of the piston. Thereafter the technician may place the piston and rings within a piston ring compressor. The piston ring compressor compresses the piston rings within the grooves of the piston so that the piston assembly can be properly inserted within the cylinder.
Once the piston is properly inserted within the piston ring compressor, the technician manually lifts the piston assembly and aligns it with the cylinder. After the technician aligns the assembly with the cylinder, it is manually inserted (connecting rod first) into the cylinder and the connecting rod is then connected to the crankshaft.
However, a single technician cannot insert the piston assembly entirely into the cylinder. Accordingly, a second technician is positioned on a rear side of the internal combustion engine and continues the insertion process. This not only ensures that the piston assembly is completely inserted within the cylinder, but equally ensures that the connecting rod is properly aligned with and connected to the crankshaft. These same steps must be performed upwards of eight or more times for each engine block, depending on the number of cylinders within the engine block.
As is known, however, some internal combustion engines are very large such as internal combustion engines which power, for example, power generation sets, earth working machinery, paving machinery, load transfer carrying machinery and the like. Due to the size of these internal combustion engines, the piston assemblies as well as other components of such engines must likewise be larger in size. This results in a piston assembly which may weigh upwards of 25 kilograms (approximately fifty-five (55) pounds) or more.
When the piston assembly is of such a size and weight it may be difficult for the technician to manually lift the piston assembly. This is especially true when the piston ring compressor assembly is placed about the crown of the piston, which adds further weight to the entire assembly. Due to the weight of the piston assembly and compressor, it may be difficult for the technician to align and insert the piston assembly into the cylinder. These problems are only increased by the fact that the above assembly steps must be performed countless times during a single workday.
In order to solve these problems, current methods of assembling an internal combustion engine include using more than one technician to lift the piston assembly and perform the aligning and inserting steps. Alternatively, it is known that several technicians may take turns lifting the piston assembly and performing the aligning and inserting steps. In either case, these solutions are not very efficient, and typically lead to higher manufacturing and production costs. Of course, these higher manufacturing and production costs are then passed along to the consumer by raising the cost of the machine which utilizes such engine.
The present invention is directed to overcoming one or more of the problems as set forth above.
DISCLOSURE OF THE INVENTION
In one aspect of the present invention a method of inserting a piston assembly into a cylinder of an engine block is provided. This method includes inserting a piston assembly into a barrel assembly and rotating the barrel assembly from a vertical position to a horizontal position. The barrel assembly is then aligned with the cylinder of the engine block. Thereafter, the piston assembly is inserted into the cylinder of the engine block.
In another aspect of the present invention, a method of inserting a piston assembly into a cylinder of an engine block using a piston insertion machine is provided. The piston insertion machine includes a barrel assembly adapted for housing the piston assembly therein, and which is moveable by compression components. The method includes inserting the piston assembly into the barrel assembly, and rotating the barrel assembly from a vertical position to a horizontal position. The barrel assembly is also aligned with the cylinder of the engine block. The barrel assembly is extended to the cylinder and the piston assembly is then inserted into the cylinder of the engine block.
REFERENCES:
patent: 3952393 (1976-04-01), Van Ravenswaay et al.
patent: 4794690 (1989-01-01), Yamanaga et al.
patent: 4887341 (1989-12-01), Sakimoro et al.
patent: 5974650 (1999-11-01), Kawabata et al.
patent: 6047472 (2000-04-01), Koch et al.
patent: 6138340 (2000-10-01), Yoshida
patent: 401281832 (1989-11-01), None
patent: 11033847 (1999-02-01), None
Cook James A.
Moore Brad A.
Shaffer Kevin R.
Thien James L.
Walters Robert L.
Bryant David P.
Calderon Andrew M.
Caterpillar Inc.
Cozakt Jermie E.
LandOfFree
Method of inserting a piston assembly into a cylinder of an... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of inserting a piston assembly into a cylinder of an..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of inserting a piston assembly into a cylinder of an... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2836699