Machine element with at least a fitting member pressure-fitted on a shaft and method of making the same
First Claim
1. A machine element comprising:
- a shaft member; and
at least one fitting member pressure-fitted on said shaft, said at least one fitting member having a bore for receiving said shaft and said shaft having at least an area formed with diamond knurling protrusions on which the fitting member is fitted,wherein said bore includes alternating arcuate and chordal surfaces on an inner peripheral surface thereof, at least one of said chordal surfaces having a perpendicular chord from a center of the bore shorter than a radius of the diamond knurling protrusions as measured from an axial center of the shaft and the arcuate surfaces being included in a circumcircular inner surface of the bore, whereby the fitting member is configured to be forced onto the diamond knurling protrusions of the shaft with at least one of said chordal surfaces of the bore engaging a corresponding outer surface on the diamond knurling protrusions.
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Accused Products
Abstract
A machine element has a shaft and at least a fitting member such as a cam or gear mounted on the shaft by pressure-fit. The fitting member has a bore for receiving the shaft. The shaft is formed with protrusions at least an area of the shaft on which the fitting member is fitted. The protrusions preferably extend continuously or discretely, peripherally or helically on the outer surface of the shaft and have a diameter larger than than the remaining areas of the shaft. The bore of the fitting member is formed with at east an inner chordal surface having a perpendicular from the center of the bore smaller than the radius of the protrusions. The fitting member is configured to be forced onto the protrusions of the shaft with at least one inner chordal surface forming a corresponding outer surface on the protrusions in a shaving and/or deforming operation.
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Citations
20 Claims
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1. A machine element comprising:
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a shaft member; and at least one fitting member pressure-fitted on said shaft, said at least one fitting member having a bore for receiving said shaft and said shaft having at least an area formed with diamond knurling protrusions on which the fitting member is fitted, wherein said bore includes alternating arcuate and chordal surfaces on an inner peripheral surface thereof, at least one of said chordal surfaces having a perpendicular chord from a center of the bore shorter than a radius of the diamond knurling protrusions as measured from an axial center of the shaft and the arcuate surfaces being included in a circumcircular inner surface of the bore, whereby the fitting member is configured to be forced onto the diamond knurling protrusions of the shaft with at least one of said chordal surfaces of the bore engaging a corresponding outer surface on the diamond knurling protrusions. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A machine element comprising
a shaft member; - and
at least one fitting member pressure-fitted on said shaft, said at least one fitting member having a bore for receiving said shaft and said shaft having at least an area formed with axial-groove knurling protrusions on which the fitting member is fitted, wherein said bore includes alternating arcuate and chordal surfaces on an inner peripheral surface thereof, at least one of said chordal surfaces having a perpendicular chord from a center of the bore shorter than a radius of the axial-groove knurling protrusions as measured from an axial center of the shaft and the arcuate surfaces being included in a circumcircular inner surface of the bore, whereby the fitting member is configured to be forced onto the axial-groove knurling protrusions of the shaft with at least one of said chordal surfaces of the bore engaging a corresponding outer surface on the protrusions. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A machine element comprising:
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a shaft member; and at least one fitting member pressure-fitted on said shaft, said at least one fitting member having a polygon-shaped bore for receiving said shaft and said shaft having at least an area formed with protrusions on which the fitting member is fitted, wherein said polygon-shaped bore of said at least one fitting member is in a form of a regular polygon of which the angular number is in a range of 6 to 12 on an inner peripheral surface thereof, each surface of said polygon-shaped bore having a perpendicular chord from a center of the bore shorter than a radius of the protrusions as measured from an axial center of the shaft whereby the fitting member is configured to be forced onto the protrusions of the shaft with radially outer surfaces of said polygon-shaped bore engaging a corresponding outer surface on the protrusions. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification