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:
Jul. 14, 1998
Filed:
Jun. 12, 1996
Hiroshi Miida, Niigata-ken, JP;
Yoshihito Ohya, Niigata-ken, JP;
Motoaki Hayashi, Niigata-ken, JP;
Hisanori Okamoto, Saitama-ken, JP;
Masashige Uematsu, Saitama-ken, JP;
Kabushiki Kaisha Riken, , JP;
Abstract
The invention particularly relates to a solenoid valve used in a control fluid, and one end of a center pole on the side opposite from a plunger is covered with theend face of a housing, and a communication passage is formed in the housing to communicate a through hole of the center pole with an opening formed on the housing on the side of the plunger. The communication passage has an end face groove and at least one side face groove on the end face and the side face of the housing. A volume of the side face groove is larger than a variation in volume of a space between the plunger and the center pole due to the movement of the plunger, and it is 2.5 times or more of the variation in volume of the space between the plunger and the center pole due to the movement of the plunger. Thus, the control fluid of the plunger on the opposite side from the center pole is reduced to enter along the outer periphery of the plunger into the space between the plunger and the center pole, and impurities can be easily and reliably prevented from being accumulated between the center pole and the plunger.