Title:
VARIABLE VALVE TIMING DEVICE
Document Type and Number:
Japanese Patent JP2959254
Kind Code:
B2
Abstract:
PURPOSE: To enhance the durability of gears in a variable valve timing device of an internal-combustion engine and decrease the meshing noise to be generated therefrom by reducing the contact pressure in meshing of gears which couple together cam shafts and drive.
CONSTITUTION: A variable valve timing device (VTT) 1 is split into a phase conversion part 9 to convert the rotational phase of a cam shaft 5 and a hydraulic type drive part 10 to drive the phase conversion part 9. The phase conversion part 9 is arranged capable of rotating in a single piece with the cam shaft 5, and the casing of the drive part 10 is provided on a cylinder head 3 non- rotatably. Through a bearing 26 a ring gear 13 of the phase conversion part 9 is coupled with an operational rod 24 of the drive part 10. A scissors gear 7 fixed to another cam shaft 6 is coupled with a scissors gear 8 constituting the phase conversion part 9 and is driven. Accordingly an inertia load in a portion corresponding to the phase conversion part 9 is solely applied to the cam shaft 5 when it is rotated, and the inertia load applied to the two scissors gears 7, 8 is reduced in a portion corresponding to the drive part.
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Inventors:
YAMAZAKI MASAMI
WATANABE ATSUSHI
MORYA YOSHITO
WATANABE ATSUSHI
MORYA YOSHITO
Application Number:
JP1137492A
Publication Date:
October 06, 1999
Filing Date:
January 24, 1992
Export Citation:
Assignee:
TOYOTA JIDOSHA KK
International Classes:
F01L1/02; F01L1/34; (IPC1-7): F01L1/34; F01L1/02
Domestic Patent References:
| JP2123208A | ||||
| JP5125912A | ||||
| JP579306A | ||||
| JP59181208U |
Attorney, Agent or Firm:
Hironobu Onda
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