Metal working – Method of mechanical manufacture – Prime mover or fluid pump making
Reexamination Certificate
1999-01-29
2001-03-06
Cuda Rosenbaum, I (Department: 3726)
Metal working
Method of mechanical manufacture
Prime mover or fluid pump making
C029S888060, C029S402160
Reexamination Certificate
active
06195886
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method of repairing a cylinder head of a water cooling type internal combustion engine, in particular, to a method of repairing a broken portion within the cylinder head located between a cooling water passage and the combustion chamber.
2. Description of the Related Art
A water cooling type internal combustion engine usually has cooling water passages formed within a cylinder head which defines in itself a combustion chamber for the engine. It has been found that cracks, other damage and even broken portions within the cylinder head between the cooling water passage and the combustion chamber will occur after a long-period use of such internal combustion engine.
It is desirable to repair, rather than replace, damaged or broken portions. However, to make repair of the broken portions of a cylinder head of an internal combustion engine a viable option, it is required that the repairing process be accomplished easily, at a low cost and that a damaged cylinder head be restored to its original state and provide its predetermined performance after repairing.
It is an object of the present invention to provide a novel and useful method of repairing a cylinder head of an internal combustion engine, so as to satisfy and meet the above requirements.
SUMMARY OF THE INVENTION
To achieve the above-described object of the present invention, the present invention provides an improved method for repairing a cylinder head of an internal combustion engine. The method comprises the steps of: cutting away the boundary walls including broken portions, preferably until the cut reaches a depth of one-half the cross section of the cooling water passage; Fixing pipe portions preferably half-pipes each having a semicircular cross section which is equal in size to one-half the cross section of the cooling water passage, in the cylinder head from which the boundary walls have been partially removed in a manner such that an inner surface of a half-pipe portion may serve to form a cooling water passage after repairing treatment.
By virtue of the method according to the present invention the repair operation can be completed easily at a low cost because the cylinder head need only be cut away to a shallow depth. Further, at least a part of a cooling water passage is formed by the inner surface of a half-pipe having a semicircular cross section that is equal in size to one-half the cross section of the cooling water passage. As a result, the remaining portion of the original passage serves as a guide to ensure that the cooling water passage is restored to its original state. In this way engine performance is maintained.
In accordance with a preferred embodiment, prior to the step of fixing a half-pipe in a predetermined position, a guide member having an outer periphery surface that conforms to the corresponding cooling water passage without forming any clearance therebetween, is inserted in the cooling water passage to be repaired. In this way, the outer periphery surface of a guide member may serve as a positioning member for positioning a pipe portion so that the half-pipe may be attached at a correct position with precision. This step ensures easy attachment of each of the half-pipe portions. Moreover, when a half-pipe is being fixed in position by means of welding, the outer periphery surface of a guide member can serve to prevent molten metal from entering a cooling water passage.
REFERENCES:
patent: 3449815 (1969-06-01), Jones, Jr. et al.
patent: 3450575 (1969-06-01), Riscky
patent: 5341554 (1994-08-01), Diperstein
patent: 5499892 (1996-03-01), Reed
Bednarek Michael D.
Cuda Rosenbaum I
Pittman Shaw
Toei Engineering Co., Ltd.
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