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:
Mar. 25, 1986
Filed:
Jul. 02, 1984
Kyosuke Haga, Anjoh, JP;
Tsuneo Tanaka, Okazaki, JP;
Toyoda Koki Kabushiki Kaisha, Kariya, JP;
Abstract
A rotary servovalve includes a valve sleeve and a rotor relatively rotatably fitted therein, and includes a pressure control section composed of lands angularly spaced from each other when the servovalve is in a neutral condition and a pressure characteristic adjusting section composed of lands disposed in overlapping relation to each other when the servovalve is in the neutral condition. The lands of the pressure control section have first chamfers for gradually reducing the area of communication between fluid supply and discharge passages as the valve sleeve and the rotor are relatively turned, and the lands of the pressure characteristic adjusting section have second and third chamfers for gradually increasing and then gradually reducing the area of communication between the fluid supply and discharge passages as the valve sleeve and the rotor are relatively turned. The second and third chamfers, and the first chamfers are effectively combined for pressure control to provide desired valving characteristics.