Camshaft-manufacturing method and gear shaft-manufacturing method
AssigneeNippon Steel & Sumitomo Metal Corporation
InventorsMasaaki Mizumura, Atsushi Tomizawa, Hidehiro Arita
Life of this patent
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Abstract
A camshaft-manufacturing method includes: a split die group preparation step; a processing preparation step of preparing a cam including a through-hole, a cam body which is smaller than each of the cam accommodation portions, and ribs which are provided on both sides in a thickness direction of the cam body and configured to be fitted into the rib accommodation portions, and a hollow shaft, accommodating the cam body in the cam accommodation portion and fitting the ribs in the rib accommodation portion, and inserting the hollow shaft into the through-hole of the cam; and a processing step of performing hydroform processing, and fixing the cam to the hollow shaft by expanding the hollow shaft.
Claims13
A camshaft-manufacturing method, comprising:
- preparing a plurality of split dies including recessed cam accommodation portions provided on side surfaces and rib accommodation portions formed in the recessed cam accommodation portions, configuring a split die group by butting side surfaces of the split dies, and forming a plurality of cam accommodation portions including the recessed cam accommodation portions between each adjacent pair of the split dies, in order to prepare the split die group;
- preparing a cam including a through-hole, a cam body which is smaller than each of the cam accommodation portions, and ribs which are provided on both sides in a thickness direction of the cam body and configured to be fitted into the rib accommodation portions, and a hollow shaft, and arranging the cam and the shaft so that the cam body is accommodated in the cam accommodation portions, the ribs are fitted in the rib accommodation portions, and the hollow shaft is inserted into the through-hole of the cam, in order to prepare processing;
- and
- introducing pressurized fluid into a hollow portion of the hollow shaft and performing hydroform processing, and fixing the cam to the hollow shaft by expanding the hollow shaft, in order to perform the processing.
A gear shaft-manufacturing method, comprising:
- preparing a plurality of split dies including recessed gear accommodation portions provided on side surfaces and rib accommodation portions formed in the recessed gear accommodation portions, configuring a split die group by butting side surfaces of the split dies, and forming a plurality of gear accommodation portions including the recessed gear accommodation portions between each adjacent pair of the split dies, in order to prepare the split die group;
- preparing a gear including a through-hole, a gear body which is smaller than each of the gear accommodation portions, and ribs which are provided on both sides in a thickness direction of the gear body and configured to be fitted into the rib accommodation portions, and a hollow shaft, and arranging the gear and the hollow shaft so that the gear body is accommodated in the gear accommodation portions, the ribs are fitted in the rib accommodation portions, and the hollow shaft is inserted into the through hole of the gear, in order to prepare processing;
- and
- introducing pressurized fluid into a hollow portion of the hollow shaft and performing hydroform processing, and fixing the gear to the hollow shaft by expanding the hollow shaft, in order to perform the processing.
Dependencies are inferred from the claim text.