The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 25, 2013
Filed:
Nov. 02, 2009
Hideki Yamagata, Sagamihara, JP;
Mamoru Hosogai, Sagamihara, JP;
Hideki Tsuchiya, Sagamihara, JP;
Yoshiharu Miya, Sagamihara, JP;
Tomoyuki Fujita, Kani, JP;
Koichiro Akatsuka, Gifu, JP;
Kenji Yazaki, Kani, JP;
Hideki Yamagata, Sagamihara, JP;
Mamoru Hosogai, Sagamihara, JP;
Hideki Tsuchiya, Sagamihara, JP;
Yoshiharu Miya, Sagamihara, JP;
Tomoyuki Fujita, Kani, JP;
Koichiro Akatsuka, Gifu, JP;
Kenji Yazaki, Kani, JP;
Kayaba Industry Co., Ltd., Tokyo, JP;
Abstract
A solenoid actuator () attached to hydraulic equipment comprises a shaft () connected to the hydraulic equipment, a plunger () fixed to the shaft (), a coil () which magnetically drives the plunger (), and a first bearing () and a second bearing () supporting the shaft () on either sides of the plunger (). A plunger front chamber () is formed between the first bearing () and the plunger (), and a plunger rear chamber () is formed between the plunger () and the second bearing (). By providing a plunger exterior oil passage () on the outside of the plunger () to connect the plunger front chamber () to the plunger rear chamber (), working oil flows through the plunger exterior oil passage () every time the plunger () strokes, thereby preventing a deposit of contaminant on the plunger () without increasing a stroke resistance of the plunger ().