Title:
SELF-RESETTING, SINGLE-VALVE, DOUBLE-PISTON HYDRAULIC DRIVE DEVICE AND METHOD FOR OVERHEAD CAM ENGINE
Document Type and Number:
WIPO Patent Application WO/2022/116376
Kind Code:
A1
Abstract:
A self-resetting, single-valve, double-piston hydraulic drive device for use in an overhead cam engine. A primary drive piston (130) and an auxiliary drive piston (420) are respectively arranged on a rocker arm body (110) and a valve bridge body (410), the auxiliary drive piston (420) being connected to an exhaust valve, and a drive oil passage (120) communicates the primary drive piston (130), the auxiliary drive piston (420), and a drive control valve (150). When the drive control valve (150) opens the drive oil passage (120): the primary drive piston (130) and the auxiliary drive piston (420) become hydraulically linked, and during lift driving, the rocker arm body (110) and the valve bridge do not move, and the auxiliary drive piston (420) opens the exhaust valve. When primary lift begins, a primary piston body oil passage and an auxiliary piston oil passage are disconnected, and the auxiliary drive piston automatically resets. When the drive oil passage (120) is disconnected: in a process of driving lift by an integrated cam, the primary drive piston (130) absorbs the driving lift of the integrated cam assembly (200) on the rocker arm body (110), and thus the rocker arm body (110) does not move, and driving lift of the integrated cam is not transmitted to the side of the exhaust valve. The drive device features simple principles, and a compact structure, and improves reliability and durability in engine driving operation. The invention further relates to a self-resetting, single-valve, double-piston hydraulic drive method for an overhead cam engine
Inventors:
CHUI LAP LAM (NZ)
Application Number:
PCT/CN2021/072988
Publication Date:
June 09, 2022
Filing Date:
January 21, 2021
Export Citation:
Assignee:
JIANSU JOINTEK PREC MACHINERY CO LTD (CN)
International Classes:
F01L1/24; F01L1/18
Domestic Patent References:
| WO2016174493A1 | 2016-11-03 |
Foreign References:
| CN112177702A | 2021-01-05 | |||
| CN102787880A | 2012-11-21 | |||
| CN106640257A | 2017-05-10 | |||
| CN106150589A | 2016-11-23 | |||
| US6439195B1 | 2002-08-27 |
Attorney, Agent or Firm:
CHANGZHOU INNOVATION PATENT AGENCY (CN)
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