Title:
VALVE SYSTEM FOR ENGINE
Document Type and Number:
Japanese Patent JPS6368706
Kind Code:
A
Abstract:
PURPOSE:To prevent a bounce during high-speed rotation, by determining the configuration of a cam which sets an in-take and exhaust valve in opening and closing motions in such way that the valve speed may reach the minimal value just before the in-take and exhaust valves are nearly placed on their seats, and that the valve speed may gain the maximal value as a valve lift becomes smaller. CONSTITUTION:The configuration of a cam is specified in a valve system where the rotation of the cam is setting an in-take and exhaust valve to be driven in opening and closing motions. Namely, it is set in such a way that when a valve acceleration alpha4 is constant from the point D on the way of descending intake exhaust valve, and a valve speed mu4 is falling linearly, the valve speed is set so as to reach the minimal value (m) in the position (c) located shortly before the initial position (b) where the valve is to be placed on its seat. Said minimal valve (m) is set almost equal to the minimum speed mu0 at the start and finish of lifting of the valve. In addition, the configuration of the cam is determined so that the valve speed may represent the lift characteristic of gaining the maximal value M, as the valve lift decreases. Thus, the valve is allowed to be placed quietly on its seat for redeuced noises.
Inventors:
MATSUMOTO YASUO
HARA SEINOSUKE
BITO HIROMICHI
KATO MANABU
HARA SEINOSUKE
BITO HIROMICHI
KATO MANABU
Application Number:
JP21349186A
Publication Date:
March 28, 1988
Filing Date:
September 10, 1986
Export Citation:
Assignee:
NISSAN MOTOR
International Classes:
F01L1/08; (IPC1-7): F01L1/08
Attorney, Agent or Firm:
Masaki Goto