US3595131A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of machining crank structures
Assignee: Skoda op
•
Filing: 1969-01-27
•
Granted: 1971-07-27
•
Expires: 1989-01-27
Abstract
Abstract A method of machining a crank structure and in particular a crankpin. During machining of the crankpin it is rotated about a predetermined axis which extends parallel to the axis of the crankpin. A milling cutter is maintained in engagement with the crankpin and rotated synchronously therewith, and the milling cutter is simultaneously rotated about its own axis so as to effect the cutting operations while the milling cutter turns simultaneously and synchronously with the crankpin. The axis of the milling cutter extends perpendicularly to the axis of the crankpin and is initially displaced beyond the crankpin axis during a rough cutting operation where a cutting end face of the milling cutter engages the crankpin, this end face being situated in a plane perpendicular to the axis of the milling cutter. During a finish cutting operation the axis of the milling cutter is displaced so as to perpendicularly intersect the axis of the crankpin, and the milling cutter and crankpin are again turned synchronously through the circular paths.
Inventors
- 👤 Frantisek Rozanek
- 👤 Oldrich Brabec
- 👤 Jaroslav Chmelik
- 👤 Miroslav Malek
- 👤 Lubomir Kres
- 👤 Ivan Kraus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:14
CPC Classifications
B; B23; B23C; B23C3/00; B23C3/06; B23C2220/00; B23C2220/08; B23C2220/64; Y; Y10; Y10T; Y10T409/00; Y10T409/30; Y10T409/30084; Y10T409/30112; Y10T409/302968; Y10T409/303248
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
148 words
In a method of machining a crankpin, the steps of rotating the crankpin about an axis parallel to the axis of the crankpin, providing means for driving a milling cutter in a vertical and a horizontal direction synchronously with the rotation of the crankpin, sensing the rotation of the crankpin, resolving the rotation thereof into a vertical and horizontal component, driving the milling cutter in response to the resolved vertical and horizontal components to move the milling cutter in a path approximating a circle about a center displaced from the axis of rotation of the crankpin, maintaining said milling cutter in engagement with the crankpin during rotation thereof and rotating the milling cutter simultaneously about its own axis with the latter axis extending perpendicularly with respect to the axis of the crankpin so that the milling cutter machines the crankpin simultaneously with the rotary movement of the latter.
Claim 2
Dependent Claim
148 words
In a method of machining a crankpin, the steps of rotating the crankpin about an axis parallel to the axis of the crankpin, providing means for driving a milling cutter in a vertical and a horizontal direction synchronously with the rotation of the crankpin, sensing the rotation of the crankpin, resolving the rotation thereof into a vertical and horizontal component, driving the milling cutter in response to the resolved vertical and horizontal components to move the milling cutter in a path approximating a circle about a center displaced from the axis of rotation of the crankpin, maintaining said milling cutter in engagement with the crankpin during rotation thereof and rotating the milling cutter simultaneously about its own axis with the latter axis extending perpendicularly with respect to the axis of the crankpin so that the milling cutter machines the crankpin simultaneously with the rotary movement of the latter.
Claim 3
Dependent Claim
54 words
In a method as recited in claim 1 and wherein the center of a circle along which the milling cutter rotates in synchronism with the crankpin is displaced from the center of the circle around which the crankpin rotates by a selected distance which will determine the diameter to which the crankpin is milled.
Claim 4
Dependent Claim
129 words
In a method as recited in claim 2 and wherein said milling cutter has a cutting end face located in a plane perpendicular to the axis of the milling cutter and engaging the crankpin to mill the latter, said milling cutter being positioned first with respect to the crankpin to carry out a rough cut and then with respect to the crankpin to carry out a finishing cut, the axis of the milling cutter being displaced beyond and extending perpendicularly to the axis of the crankpin to an extent providing only engagement of the periphery of the milling cutter with the crankpin during the rough cutting of the operation, the axis of the milling cutter passing through and intersecting the axis of the crankpin during the finished cutting operation.
Claim 5
Dependent Claim
60 words
In a method as recited in claim 3 and wherein said crankpin forms part of a crankshaft and is situated between and carried by a pair of crank arms, the step of machining inner surfaces of the crank arms with the milling cutter by applying a cylindrical side cutting surface thereof to the inner side surfaces of the crank arms.
Claim 6
Dependent Claim
62 words
In a method as recited in claim 1 and wherein said crankpin forms part of a crankshaft having journals, the step of machining a journal at a time different from the machining of the crankpins while terminating the rotary movement of the milling cutter and maintaining the latter in engagement with the journal during simultaneous rotation of the journal about its axis.
Claim 7
Dependent Claim
64 words
In a method as recited in claim 1 and wherein said crankpin forms part of a crankshaft which has a pair of crank arms carrying the crankpin, the step of machining each crank arm at its periphery with the milling cutter while displacing the milling cutter along an elliptical path simultaneously with the rotation of each crank arm about the axis of the crankshaft.
Claim 8
Dependent Claim
42 words
In a method as recited in claim 6 and wherein a pair of milling cutters are simultaneously placed in engagement with the periphery of the pair of arms which carry the crankpin for simultaneously machining the peripheries of the pair of arms.
Claim 9
Dependent Claim
39 words
In a method as recited in claim 1 wherein the milling cutter is driven by an electric motor and includes the steps of converting the vertical and horizontal components into electrical signals and transmitting the signals to the motor.
Claim 10
Dependent Claim
28 words
In a method as recited in claim 1 including the step of maintaining the angular movement of the milling cutter equal to the angular movement of the crankpin.
References Cited (Backward Citations)
US1649109A
Cited
US1919290A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-26 | 1975-01-25 | 1975-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-26 | 1979-01-25 | 1979-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-26 | 1983-01-25 | 1983-07-27 | $7700.00 | Window Closed / Lapsed |