Title:
VALVE TIMING CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE
Document Type and Number:
WIPO Patent Application WO/2018/230173
Kind Code:
A1
Abstract:
The present invention comprises: a back pressure chamber 38 that is formed on a rear end side of a lock pin 33 of a pin accommodating hole 32 provided in a first vane 14a; a discharge passage 39 that is disposed inside the back pressure chamber and allows communication between the back pressure chamber and a region outside a housing 6; and a communication passage 41 that is provided in a vane rotor 9 and communicates with a delay angle side oil pressure chamber 15 and that has a small opening 41c which is open to the back pressure chamber in a first state where the lock pin is inserted into a lock hole 31, and which is blocked by the lock pin in a second state where the lock pin has been removed from the lock hole. A first cross-sectional area Se of the small opening of the communication passage is ≥ 1 mm2 and is formed so as to be smaller than a second cross-sectional area Sv of a discharge groove. In addition, the relation Se/Sv ≤ 0.18 is set. Due to this configuration, an excessive rise in oil pressure caused by releasing of a lock can be suppressed and locking of a lock member can be speedily released.
Inventors:
OKADA SHOHEI (JP)
WATANABE KOTARO (JP)
HATSUGAI KUNINAGA (JP)
WATANABE KOTARO (JP)
HATSUGAI KUNINAGA (JP)
Application Number:
PCT/JP2018/016904
Publication Date:
December 20, 2018
Filing Date:
April 26, 2018
Export Citation:
Assignee:
HITACHI AUTOMOTIVE SYSTEMS LTD (JP)
International Classes:
F01L1/356
Foreign References:
| JP2017031908A | 2017-02-09 | |||
| JP2016065534A | 2016-04-28 | |||
| JP2003262108A | 2003-09-19 | |||
| JP4017860B2 | 2007-12-05 | |||
| JP2017008731A | 2017-01-12 |
Attorney, Agent or Firm:
KOBAYASHI, Hiromichi et al. (JP)
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