CRANKSHAFT, METHOD OF ASSEMBLING THE CRANKSHAFT, ROTARY COMPRESSOR AND REFRIGERATION-CYCLE DEVICE
First Claim
1. A crankshaft comprising:
- a shaft portion comprising a straight axial line; and
at least one crank portion provided in the shaft portion so as to be eccentric to the axial line of the shaft portion,the at least one crank portion being formed from a crank piece, which is an element separate from the shaft portion, and the crank piece comprising a fitting hole in which the shaft portion is fit by predetermined “
interference”
, and a slit-like slot one end of which is opened in an inner circumferential surface of the fitting hole, and an other end of which extends along a diametric direction of the fitting hole so as to be closed inside the crank piece, and is opened in both end surfaces of the crank piece,the fitting hole being deformed so as to expand a diameter of the fitting hole when expanding a width of the slot, and the shaft portion being fit in the fitting hole of the crank piece by the predetermined “
interference”
when the shaft portion is inserted in the deformed fitting hole and the fitting hole restores an original form while the shaft portion is in the fitting hole.
1 Assignment
0 Petitions
Accused Products
Abstract
According to one embodiment, a crank portion is formed from a crank piece, an element separate from a shaft portion. The crank piece includes a fitting hole in which the shaft portion is fit by predetermined “interference” and a slit-like slot with one end opened in an inner circumferential surface of the fitting hole, and an other end closed inside the crank piece. The fitting hole is deformed so as to expand its diameter when expanding a width of the slot. The shaft portion is fit in the fitting hole of the crank piece by the predetermined “interference” when inserted in the deformed fitting hole and the fitting hole restores an original form while the shaft portion is in the fitting hole.
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Citations
14 Claims
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1. A crankshaft comprising:
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a shaft portion comprising a straight axial line; and at least one crank portion provided in the shaft portion so as to be eccentric to the axial line of the shaft portion, the at least one crank portion being formed from a crank piece, which is an element separate from the shaft portion, and the crank piece comprising a fitting hole in which the shaft portion is fit by predetermined “
interference”
, and a slit-like slot one end of which is opened in an inner circumferential surface of the fitting hole, and an other end of which extends along a diametric direction of the fitting hole so as to be closed inside the crank piece, and is opened in both end surfaces of the crank piece,the fitting hole being deformed so as to expand a diameter of the fitting hole when expanding a width of the slot, and the shaft portion being fit in the fitting hole of the crank piece by the predetermined “
interference”
when the shaft portion is inserted in the deformed fitting hole and the fitting hole restores an original form while the shaft portion is in the fitting hole. - View Dependent Claims (2, 3, 4, 5, 6, 12, 13, 14)
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7. A crankshaft comprising:
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a shaft portion comprising a straight axial line; and at least one crank portion provided in the shaft portion so as to be eccentric to the axial line of the shaft portion, the at least one crank portion being formed from a crank piece, which is an element separate from the shaft portion, and the crank piece comprising; a fitting hole in which the shaft portion is inserted, a slit-like slot one end of which is opened in an inner circumferential surface of the fitting hole, and an other end of which extends along a diametric direction of the fitting hole so as to be closed inside the crank piece, and is opened in both end surfaces of the crank piece, and a fastener which narrows a width of the slot. - View Dependent Claims (8, 9)
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10. A method of assembling a crankshaft comprising a shaft portion comprising a straight axial line;
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a crank piece formed from an element separate from the shaft portion, and comprising a fitting hole in which the shaft portion is inserted and a slit-like slot one end of which extends along a diametric direction of the fitting hole so as to be opened in an inner circumferential surface of the fitting hole, wherein the crank piece is attached to the shaft portion so as to be eccentric to the axial line, the method comprising; inserting the shaft portion to the fitting hole of the crank piece in a state of “
clearance fit”
;screwing a fastener which narrows a width of the slot into the crank peace, thereby deforming the fitting hole to reduce a diameter of the fitting hole in which the shaft portion is inserted, and fastening and fixing the shaft portion in the fitting hole by predetermined “
interference”
. - View Dependent Claims (11)
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Specification