Valve timing control device

Details Valve timing control device Valve timing control device

1998-12-22

2000-08-22

Lo, Weilun

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9031, F01L 1344, F01L 1300

Patent

active

061055433

ABSTRACT:
A valve timing control device comprising a valve opening and closing rotary shaft assembly rotatably assembled within a cylinder head of an internal combustion engine, a rotational transmitting member mounted around the peripheral surface of the rotary shaft assembly so as to rotate relative thereto within a predetermined range for transmitting a rotational power from a crank shaft, a vane provided on one of the rotary shaft assembly and the rotational transmitting member, a chamber formed between the rotary shaft assembly and the rotational transmitting member, and divided into an advancing chamber and a delaying chamber by the vane, a first fluid passage for supplying and discharging a fluid to and from the advancing chamber, a second fluid passage for supplying and discharging a fluid to and from the delaying chamber, a refuge hole formed in one of the rotational transmitting member and the rotary shaft assembly for accommodating therein a locking pin spring-biased toward the other of the rotary shaft assembly and the rotational transmitting member, a fitting hole formed in the other of the rotary shaft assembly and the rotational transmitting member for fitting therein a head portion of the locking pin when the rotary shaft assembly and the rotational transmitting member are synchronized in predetermined relative phase, a third passage for supplying and discharging a fluid to and from the fitting hole, a pressure back chamber formed in the refuge hole at the back of the locking pin is given communication with the inside of the cylinder head of the internal combustion engine via a communication passage formed in the rotational transmitting member or the rotary shaft assembly, and closing means for closing the communication passage when the head portion of the locking pin moves into the refuge hole by the fluid supplied to the fitting hole via the third passage.

REFERENCES:
patent: 5738056 (1998-04-01), Mikame et al.
patent: 5775279 (1998-07-01), Ogawa et al.
patent: 5797361 (1998-08-01), Mikame et al.
patent: 5865151 (1999-02-01), Fukaya et al.
patent: 5941203 (1999-08-01), Sato
patent: 5943989 (1999-08-01), Kira

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