Title:
PUMP
Document Type and Number:
WIPO Patent Application WO/2013/114813
Kind Code:
A1
Abstract:
[Problem] To provide is a pump with excellent durability. [Solution] In this pump (1), an eccentric shaft (232) which converts rotation of the drive shaft (131) of a motor (M) into reciprocating motion of a piston (21) has a hollow structure. By making the eccentric shaft (232) a hollow structure, the eccentric shaft (232) can easily deform perpendicularly to the axis of the eccentric shaft (232) (radially), and the press-fit load of a bearing (31) on the outer peripheral surface of the eccentric axis (232) can be reduced. By this means, variation of the inner radial gap of the bearing (31) is reduced, stress is more uniform over the entire circumference of the bearing, and the bearing (31) is more durable, prolonging the life of the pump (1).
Inventors:
ITOYAMA RYUJI (JP)
CHOUNO MOTOYASU (JP)
CHOUNO MOTOYASU (JP)
Application Number:
PCT/JP2013/000279
Publication Date:
August 08, 2013
Filing Date:
January 22, 2013
Export Citation:
Assignee:
ULVAC KIKO INC (JP)
International Classes:
F04B35/01; F04B37/16; F04B39/00
Foreign References:
| JPH062657A | 1994-01-11 | |||
| JPH1162834A | 1999-03-05 | |||
| JP2006022720A | 2006-01-26 | |||
| JP2005139977A | 2005-06-02 |
Attorney, Agent or Firm:
OMORI, JUNICHI (JP)
Omori Junichi (JP)
Omori Junichi (JP)
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Claims: