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. 07, 1987
Filed:
Sep. 22, 1986
Toshio Yoshinaka, Nagoya, JP;
Syuji Nagano, Toyota, JP;
Toyota Jidosha Kabushiki Kaisha, Aichi, JP;
Abstract
A four-wheel drive system for use in a vehicle includes mechanisms for preventing disengagement of the engagement sleeves of a transfer gear shift mechanism while permitting limited displacement of the engagement sleeves, shift forks and fork shafts to prevent a large amount of friction between grooves in the engagement sleeves and engagement fingers of the shift forks. Disengagement of the engagement sleeves is prevented by formation of chamfers and tapered surfaces on corresponding portions of the engagement sleeves, splines and sprockets. Limited displacement of the engagement sleeves, shift forks and fork shafts is accomplished by means of notches in the fork shafts which are larger than corresponding locking pins, so that the fork shafts, shift forks and engagement sleeves are displaceable within a distance corresponding to the difference in size between the notches and locking pins. The above features prevent disengagement of the engagement sleeves without undue friction and consequent sludge buildup, even when a torque is applied through the transfer gear shift mechanism and thrust forces are exerted on the engagement sleeves.