US 9,810,107 B2
Intermediate phase adjustment apparatus of CVVT
Chung Han Oh, Seongnam-si (KR); Yun Seok Kim, Yongin-si (KR); and Jong Kuk Park, Yongin-si (KR)
Assigned to HYUNDAI MOTOR COMPANY, Seoul (KR); and KIA MOTORS CORPORATION, Seoul (KR)
Filed by HYUNDAI MOTOR COMPANY, Seoul (KR); and KIA MOTORS CORPORATION, Seoul (KR)
Filed on Dec. 4, 2015, as Appl. No. 14/960,079.
Claims priority of application No. 10-2015-0105162 (KR), filed on Jul. 24, 2015.
Prior Publication US 2017/0022853 A1, Jan. 26, 2017
Int. Cl. F01L 1/34 (2006.01); F01L 1/344 (2006.01)
CPC F01L 1/3442 (2013.01) [F01L 2001/34423 (2013.01); F01L 2001/34426 (2013.01)] 6 Claims
OG exemplary drawing
 
1. An intermediate phase adjustment apparatus of a CVVT of which an advance chamber and a retard chamber are formed between a rotor and a stator, comprising:
first and second check valves provided in the rotor to prevent backflow of oil when the oil moves from one chamber to another chamber in order to secure a parking position of a lock pin; and
a first oil inlet portion provided in the advance chamber and a second oil inlet portion provided in the retard chamber, wherein each of the first and second oil inlet portions corresponds to each inlet of the first and second check valves, respectively;
wherein the second oil inlet portion provided at the retard chamber is larger than the first oil inlet portion provided at the advance chamber by a predetermined size, and an open angle of the second check valve for making oil to flow into the retard chamber is larger than an open angle of the first check valve for making the oil to flow into the advance chamber, thereby preventing an offset occurrence by a cam torque.