Gear cutting – milling – or planing – Gear cutting – With work clamping
Reexamination Certificate
1999-05-18
2001-02-13
Howell, Daniel W. (Department: 3722)
Gear cutting, milling, or planing
Gear cutting
With work clamping
C029S525000, C074S434000, C403S282000
Reexamination Certificate
active
06186710
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to a method for rotationally driving a gear material when the gear material is cut using a hob, and a gear thus hob machined.
As a method for rotationally driving a gear material when the gear material is gear cut machined using a hob, there has heretofore been employed a method in which a carrier is fixedly bolted to the outer periphery of a gear material so that the gear material is rotationally driven through the carrier, or a method in which a plurality of wedge-shaped projections are formed on an end face of a drive shaft of a gear hobbing machine in such a manner as to extend radially with respect to an axis thereof so that a rotational force of the drive shaft is transmitted to the gear material through the projections which are caused to bite into the end face of the gear material, for example.
In the first-mentioned method, the transmission of a rotational force between the carrier and the gear material is performed by only friction between the gear material, and the carrier and the bolt under the effect of a tightening force of the bolt. Therefore, it is difficult to transmit a large rotational driving force to the gear material. For this reason, a heavy cutting using a hob is difficult to perform and a gear cut machining cannot be performed efficiently.
On the other hand, in the second-mentioned method, a large rotational force can be transmitted to the gear material because the projections are caused to bite into the gear material. However, other problems are encountered in that recesses are left on the end face of the gear material as a trace of the projections bitten into the end face, and that the peripheral area of the recesses is swollen. For this reason, it is necessary to remove the swollen area when the gear is of the type that the end face of the gear is used as in a planet gear of a differential gear assembly described in Patent National Publication (Tokuhyo) No. 502713/1994, for example. As a consequence, the number of process is increased to that extent, thus resulting in decrease of gear manufacturing efficiency. Moreover, even if the swollen area is removed, the recesses are left as they are. To remove those recesses, a great number of processes are required. As a consequence, gear manufacturing efficiency is further decreased.
SUMMARY OF THE INVENTION
It is, therefore, a general object of the present invention to provide a method for rotationally driving a gear material when a hob machining is performed and a gear, in which the above-mentioned problems inherent in the prior art can be obviated.
From one aspect of the present invention, there is provided a method for rotationally driving a gear material when an outer peripheral surface of the gear material is gear machined using a hob, wherein a method for rotationally driving a gear material when a hob machining is performed, comprising forming a drive hole in one end face of the gear material in such a manner as to extend on an axis of the gear material, fitting, under pressure, a shaft member having a non-circular configuration in section in the drive hole in such a manner as to plastically deform an inner peripheral surface of the drive hole, and rotationally driving the gear material through the shaft member.
From another aspect of the present invention, there is also provided a gear comprising a drive hole formed in one end face of a gear material, the drive hole having a circular configuration in section and extending on an axis of a gear material, and a concave groove formed in an inner peripheral surface of the drive hole, the concave groove being formed by plastically deforming the inner peripheral surface of the drive hole with angular portions of a shaft member having a polygonal configuration in section and fitted, under pressure, in the drive hole, the gear being manufactured by gear machining the gear material using a hob while rotationally driving the gear material through the shaft member fitted, under pressure, in the drive hole.
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Nishiji Makoto
Saniez Jean Michel
Fish & Richardson P.C.
Howell Daniel W.
Zexel Corporation
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