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:
Aug. 18, 1987
Filed:
Jun. 19, 1986
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Abstract
A device for locking/unlocking rotation of an eccentric bearing interposed between a piston-pin and a connecting rod of an internal combustion engine for changing the compression ratio of the engine. The eccentric bearing has two lock holes, two guide grooves extending circumferentially from the lock holes and two colliding surfaces. The connecting rod has at least one lock-pin hole and a lock-pin is slidably inserted in the lock-pin hole. When the lock-pin is driven toward the eccentric bearing, the lock-pin can move toward the eccentric bearing and can engage the lock hole, thereby locking the rotation of the eccentric bearing. Since the colliding surfaces are provided opposed to said guide grooves, the lock-pin can reliably engage one of the lock holes without jumping the lock hole whether the eccentric bearing rotates in a normal direction or in a reverse direction. As a result, a reliable changing between a high compression ratio and a low compression ratio can be obtained.