Solenoid actuator

Details Solenoid actuator Solenoid actuator

2011-07-05

2011-07-05

Mai, Anh T (Department: 2832)

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

With magneto-mechanical motive device

C335S219000, C335S220000, C335S261000, C335S279000, C335S281000, C335S296000, C335S297000, C251S129150

Reexamination Certificate

active

07973627

ABSTRACT:
A solenoid actuator (1) attached to a hydraulic equipment comprises a shaft (5) connected to the hydraulic equipment, a plunger (4) fixed to the shaft (5), a coil (12) which magnetically drives the plunger (4), and a first bearing (7) and a second bearing (8) supporting the shaft (5) on both sides of the plunger (4). A plunger front chamber (74) is formed between the first bearing (7) and the plunger (4), a plunger rear chamber (75) is formed between the plunger (4) and the second bearing (8), and a second bearing rear chamber (76) is formed on the opposite side of the second bearing (8) to the plunger rear chamber (75). To secure an oil flow between these chambers, a plunger exterior oil passage (63), a second bearing oil passage (64), and a shaft-penetrating oil passage (65) are provided, thereby realizing a preferable balance between oil pressures acting on the second bearing (8).

REFERENCES:
patent: 3851285 (1974-11-01), Rothfuss et al.
patent: 4694270 (1987-09-01), Ichihashi
patent: 5402093 (1995-03-01), Gibas et al.
patent: 5856771 (1999-01-01), Nippert
patent: 2003/0136931 (2003-07-01), Watanabe et al.
patent: 2005/0068136 (2005-03-01), Schempp et al.
patent: 2008/0180200 (2008-07-01), Gamble
patent: 2009/0050829 (2009-02-01), Haynes et al.
patent: 2001-317653 (2001-11-01), None

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