# US 4,382,390 A · Camshaft for reciprocable piston engines

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- Number: US 4,382,390 A
- Document ID: US4382390A
- Status: Granted
- Kind: A
- Application number: 06/256,814
- Filed: 1981-04-23
- Granted: 1983-05-10
- Earliest claimed: 1975-10-18
- Assignees: Klockner-Humboldt-Deutz Aktiengesellschaft
- Inventors: Friedrich Jordan
- Web page: https://patentgrep.com/patent/US4382390A

## CPC

- F01L 1/047: Camshafts
- F16C 35/0635: {the bore of the inner ring being of special non-cylindrical shape which co-operates with a complementary shape on the shaft, e.g. teeth, polygonal sections}
- F16D 1/072: involving plastic deformation (plastic welding F16D1/068)
- F16H 53/025: {characterised by their construction, e.g. assembling or manufacturing features}
- F01L 2303/00: Manufacturing of components used in valve arrangements
- Y10T 29/49293: Camshaft making
- Y10T 29/49805: Shaping by direct application of fluent pressure
- Y10T 29/4994: Radially expanding internal tube
- Y10T 74/2101: Cams
- Y10T 403/4924: Inner member is expanded by longitudinally inserted element
- F01L: CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F16C: SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16D: COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16H: GEARING
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A camshaft with cams and bearings for reciprocable piston engines including a hollow shaft having the cams and bearings designed as cam rings and bearing rings and fastened to the hollow shaft.

## Claims

### Claim 1

A camshaft for reciprocable piston engines, the camshaft comprising in combination:
a tubular member having an outer peripheral surface and a wall of constant thickness, said tubular member being formed to rotate about a longitudinal axis and having a round portion with a wall equidistant from the axis;
a plurality of longitudinally extending, uniform undulations formed by the wall of the tubular member, said undulations having an outer surface projecting beyond the round portion; and extending a limited distance in the longitudinal direction;
a bearing friction fitted against the undulations and having an inner surface conforming to the outer surface of the undulations;
longitudinally spaced cam positions on the tubular member, each cam position being formed by radially displacing a portion of the wall of the tubular member generally in one radial direction to form a first arcuate outer surface of the wall of the tubular member, displaced toward the axis of the tubular member, and a second arcuate portion of the wall of the tubular member displaced away from the axis to form a convex bulge curved in three dimensions wherein the cam position has an out-of-round configuration, and
cam members frictionally secured to the tubular member at the cam positions, each cam member comprising a straight tubular section conforming to the shape of the tubular member around a substantial portion thereof and having a lobe coextensive with the bulge but radially displaced from the bulge to define a space between the inner surface of the lobe and outer surface of the bulge whereby the cam members are securely maintained by the out-of-round configuration of the cam positions.