Title:
ELECTROMAGNETIC TYPE DRIVE UNIT
Document Type and Number:
WIPO Patent Application WO/2019/026211
Kind Code:
A1
Abstract:
An electromagnetic type drive unit (2) is provided with a stator (4), a plunger (5), a spacer (7), a yoke (8), and a coil (16). An end portion of the plunger (5) on the stator (4) side is provided with a magnetic pole portion (5A). A first edge (5J) is provided at the outer peripheral edge of the magnetic pole portion (5A) on the stator (4) side thereof. The stator (4) is provided with a tubular magnetic control portion (4G) into which the magnetic pole portion (5A) of the plunger (5) enters. An outer peripheral surface of the tubular magnetic control portion (4G) is provided with a tapered portion (4L) becoming gradually smaller in diameter toward the plunger (5) side. A second edge (5K) is provided in a portion of the outer peripheral surface of the magnetic pole portion (5A) which is spaced apart from the first edge (5J) on the opposite side from the stator (4). The second edge (5K), upon entering a bottomed hole (4J) of the tubular magnetic control portion (4G), is subjected to a magnetic force in a direction away from the stator (4) in a gap between the second edge (5K) and an opening end (4H) of the tubular magnetic control portion (4G).
Inventors:
OKAMURA JUN (JP)
TAKIGUCHI KAZUO (JP)
TAKIGUCHI KAZUO (JP)
Application Number:
PCT/JP2017/028095
Publication Date:
February 07, 2019
Filing Date:
August 02, 2017
Export Citation:
Assignee:
HITACHI CONSTRUCTION MACH CO (JP)
International Classes:
H01F7/16
Foreign References:
| JP2007012844A | 2007-01-18 | |||
| JP2012127409A | 2012-07-05 |
Attorney, Agent or Firm:
HIROWA PATENT FIRM (JP)
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