Gear cutting – milling – or planing – Milling – Process
Patent
1995-03-20
1996-05-07
Briggs, William
Gear cutting, milling, or planing
Milling
Process
82 111, 409244, B23C 308, B23B 100, B23D 3700
Patent
active
055139329
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method of using a camshaft miller.
2. Description of the Related Art
In the known art, some types of engine units of, for example, automobiles employ double overhead camshafts (DOHC).
One example of such double overhead camshafts is shown in FIG. 1, in which a pair of cams C.sub.1, C.sub.2 ; C.sub.3, C.sub.4 ; C.sub.5, C.sub.6 ; and C.sub.7, C.sub.8 for suction and discharge, having the same phase, are provided on both sides of respective one of a plurality of journals J.sub.1, J.sub.2, J.sub.3 and J.sub.4 and a ring (fuel cam) C.sub.9 for driving a fuel pump is also mounted on one end.
When the double overhead camshaft of the above structure is manufactured, a workpiece provided with the cams C.sub.1, C.sub.2 ; C.sub.3, C.sub.4 ; C.sub.5, C.sub.6 ; and C.sub.7, C.sub.8 having the same phase on both sides of respective journals J.sub.1, J.sub.2, J.sub.3 and J.sub.4 and with the ring C.sub.9 at its one end portion is worked by means of a camshaft miller. In conventional technology, there are generally employed a method, as shown in FIG. 2, in which the respective cams C.sub.1 -C.sub.8 and C.sub.9 are subsequently worked by using a single cutter a and a method, as shown in FIG. 3, in which the adjacent two cams such as C.sub.1 and C.sub.2 of these cams are simultaneously worked by using a double cutter b.
However, according to the former working method using the single cutter a, many processes are involved and, accordingly, much time is required for working and finishing one workpiece. It is thus difficult to achieve improved productivity using any form of this method.
On the other hand, according to the latter working method using the double cutter b, in a case where the ring C.sub.9 is worked by the double cutter b, one of the cutter elements of the cutter b interferes with the ring C.sub.9 and the working is not executed precisely. In order to prevent this problem, it is necessary to work the ring C.sub.9 by another means, thus being troublesome and hence inconvenient.
SUMMARY OF THE INVENTION
An object of the present invention is hence to provide a working method using a camshaft miller capable of effectively working cams and a ring by single cutter means.
A method of using a camshaft miller for working a workpiece in which a plurality of journals are provided on the workpiece, cams having the same phases are disposed on both sides of each of the respective journals and a ring is disposed at one end of the workpiece, includes providing a cutter having, at a central portion thereof, a central chip for working a ring and other chips disposed on both sides of the central chip for simultaneously working cams having the same phases, working the cams having the same phases of each of the journals simultaneously with the other chips, subsequently with respect to the journals, and working the ring with the central chip.
According to this method, the cams and the ring can be worked by one machine and the cams having the same phases are simultaneously worked, thereby improving the productivity.
Further, it is to be noted that it is possible to work first the cams and then the ring or vice versa to attain the same functions and effects.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention will be better understood hereunder from the following detailed description and accompanying drawings showing an embodiment of the present invention. It is noted that the embodiment shown in the drawings does not limit the present invention and is used for the sake of explanation and easy understanding thereof.
In the accompanying drawings:
FIG. 1 is a plan view of a double overhead camshaft;
FIG. 2 is a view for explaining one example of a conventional working method;
FIG. 3 is a view for explaining another example of a conventional working method;
FIG. 4 is a plan view of a camshaft miller utilized for one embodiment of a working method according to the present invention; and
FIG. 5 is a view for explaining the above embodiment.
REFERENCES:
patent: 4242020 (1980-12-01), Schmid
patent: 4624610 (1986-11-01), Phillips et al.
patent: 4747236 (1988-05-01), Wedenywski
patent: 4800683 (1989-01-01), Sutwur
patent: 5029500 (1991-07-01), Ruby
Briggs William
Kabushiki Kaisha Komatsu Seisakusho
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