Title:
VARIABLE VALVE DEVICE FOR INTERNAL COMBUSTION ENGINE
Document Type and Number:
WIPO Patent Application WO/2020/189546
Kind Code:
A1
Abstract:
A variable valve device for an internal combustion engine comprises a variable mechanism capable of switching between a first state J1 and a second state, and a hydraulic control device that controls hydraulic pressure supplied to the variable mechanism. The hydraulic control device comprises a hydraulic pump 11, an oil gallery 30, a valve unit 31, a main passage 33, a bypass passage 37, a bypass valve 39, and a control unit 100. When the variable mechanism is put into the first state, the valve unit is put into a first state and pressure oil of the oil gallery is supplied to the variable mechanism. When the variable mechanism is put into the second state, the valve unit is put into a second state and pressure oil is discharged from the variable mechanism. When the internal combustion engine starts up, the valve unit is put into the first state, the bypass valve is opened, and pressure oil ejected from the hydraulic pump is supplied through the bypass passage to the valve unit.
Inventors:
TOKUMARU TAKESHI (JP)
OKAZAKI KAZUYA (JP)
NITTA JUNICHIRO (JP)
HIBI TAIGA (JP)
OKAZAKI KAZUYA (JP)
NITTA JUNICHIRO (JP)
HIBI TAIGA (JP)
Application Number:
PCT/JP2020/011060
Publication Date:
September 24, 2020
Filing Date:
March 13, 2020
Export Citation:
Assignee:
ISUZU MOTORS LTD (JP)
International Classes:
F01L13/00; F02D13/02
Foreign References:
| JP2008231968A | 2008-10-02 | |||
| JPH084511A | 1996-01-09 | |||
| JPH03217610A | 1991-09-25 |
Attorney, Agent or Firm:
HIBIYA Yukihiko et al. (JP)
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