Title:
VARIABLE VALVE GEAR FOR INTERNAL COMBUSTION ENGINE
Document Type and Number:
WIPO Patent Application WO/2012/077220
Kind Code:
A1
Abstract:
A variable valve gear (20) is provided with a varying mechanism (25) for varying the valve timing, a holding mechanism (26) for holding the valve timing at a specific time, and an oil pressure mechanism (80) for controlling the oil pressures of respective oil chambers of the variable valve gear (20). In the oil pressure mechanism (80), a communication oil path (98) through which a first supply oil path (93) and a release oil path (97) communicate with each other is provided. The first supply oil path (93) is provided on the upstream side from an oil control valve (91) and selectively supplies operating oil to either an advance chamber (37) or a retard chamber (38). The release oil path (97) is provided on the downstream side from the oil control valve (91) and supplies the operating oil to a first release chamber (57), a second release chamber (77), and a third release chamber (44). The communication oil path (98) supplies oil pressure that generates biasing force smaller than that of the release oil pressure (P1) of the first release chamber (57) to the release chamber (57), and supplies oil pressure that generates biasing force smaller than that of the release oil pressure (P2) of the second release chamber (77) to the release chamber (77).
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Inventors:
YOKOYAMA YUU (JP)
FUJIMURA HARUHITO (JP)
FUJIMURA HARUHITO (JP)
Application Number:
PCT/JP2010/072175
Publication Date:
June 14, 2012
Filing Date:
December 09, 2010
Export Citation:
Assignee:
TOYOTA MOTOR CO LTD (JP)
YOKOYAMA YUU (JP)
FUJIMURA HARUHITO (JP)
YOKOYAMA YUU (JP)
FUJIMURA HARUHITO (JP)
International Classes:
F01L1/34
Foreign References:
| JP2010223212A | 2010-10-07 | |||
| JP2010248950A | 2010-11-04 | |||
| JP2002061504A | 2002-02-28 | |||
| JPH10220207A | 1998-08-18 |
Attorney, Agent or Firm:
ONDA, Hironori et al. (JP)
Hironori Onda (JP)
Hironori Onda (JP)
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Claims: