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:
May. 10, 1988
Filed:
Feb. 13, 1987
Motonobu Akagi, Anjo, JP;
Aisin Seiki Kabushiki Kaisha, Kariya, JP;
Abstract
A motor-driven flow rate control valve device which includes a housing, a valve, a valve shaft, a return spring and a step motor. The housing has its inlet and outlet. The valve is disposed in a passage formed in the housing and is capable of keeping communication between the inlet and the outlet under control by its opening and closing action. The valve shaft is axially slidable in the housing and has a first end thereof linked to the valve. The return spring is held by a holder which includes a first end thereof secured to the housing and a second end thereof secured to a second end of the valve shaft. The return spring constantly forces the valve to move in a valve closing direction. The step motor is fixed through a motor housing to the housing and subsumes a rotor equipped with a screw mechanism for converting a rotary motion of the step motor into an axial motion of the motor shaft. One end of the motor shaft impinges upon the second end of the valve shaft. In this construction, there is provided an improvement characterized in that a spiral spring is spanned between an end portion of the rotor of the step motor and a fixation end of the motor housing. With such an arrangement, a so-called open locking state wherein the valve is locked in an open state is not created.