To inexpensively provide a plunger pump for improving the rolling fatigue service life of a rolling contact part of the rolling surface of each needle 8 and 8, an outer ring track 16a and a cam surface 6b, without requiring to extremely enhance the dimensional accuracy and installation accuracy of respective components by suppressing an increase in the bearing pressure of each surface.
At least one surface of the mutually rollingly contacting cam surface 6b and the rolling surface of each needle 8 and 8 is projected most in an intermediate part in the axial direction to a mating surface, and formed in a crowning shape being a cross-sectional convex circular arc shape of gradually inclining in the direction for going away from the mating side toward both ends in the axial direction. This constitution prevents an excessive bearing force based on an edge load from acting on the rolling contact surface without particularly enhancing the dimensional accuracy and installation accuracy of a constituting member.
| JPS5733320U | 1982-02-22 | |||
| JP2006312916A | 2006-11-16 | |||
| JP2007146941A | 2007-06-14 | |||
| JP2004278643A | 2004-10-07 | |||
| JP2004225551A | 2004-08-12 | |||
| JP2003097568A | 2003-04-03 |
Takashi Daejeon
Masaki Muto
Kinzo Koyama
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