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. 11, 1993
Filed:
Apr. 23, 1992
Michio Adachi, Obu, JP;
Haruyuki Obata, Toyota, JP;
Nippondenso Co., Ltd., Kariya, JP;
Abstract
An apparatus for controlling a valve timing in an internal combustion engine. A timing piston 7 is in splined engagement with both a camshaft sleeve connected to the camshaft 1 and a pulley sleeve connected to the timing pulley. The timing piston 7 is connected, via a ball bearing unit 8, to a screw nut 9 of a ball screw mechanism. The bearing unit 8 is connected to the nut 9, with a clearance C. A disk spring 20, via a spacer 21, urges the inner race 8a of the bearing 8 so that it abuts against a washer 23 an a snap ring 22 on the screw shaft 9. As a result, the screw shaft 9 is connected to the timing piston 7 so that the axial movement from the shaft 9 is transmitted to the piston 7, while the piston 7 is rotating on the shaft 9, and a slight radial relative movement is allowed between the screw shaft 9 and the piston 7 without generating any play in the axial movement. An oil passageway is formed for lubricating the ball nut mechanism.