Title:
INTAKE DEVICE FOR ENGINE AND ENGINE OPERATING METHOD
Document Type and Number:
WIPO Patent Application WO/2018/047446
Kind Code:
A1
Abstract:
The present invention is provided with: a first intake port (7a) and second intake port (7b); first and second intake valves (9a, 9b); a first intake cam (21) for driving the first intake valve (9a); and a second intake cam (22) which has a larger working angle than the first intake cam (21) and which drives the second intake valve (9b) in such a manner that the second intake valve (9b) opens in an early stage of the intake stroke and closes at some point during the compression stroke. An opening/closing valve (14) which is disposed in the second intake port (7b) and which closes during low-speed rotation at a low load and opens in the other operating ranges is also provided. When the second intake valve (9b) is closed at some point during the compression stroke with the opening/closing valve (14) being in the closed state, the second intake valve (9b) and the opening/closing valve (14) form a pressure-accumulation chamber filled with compressed gas inside the second intake port (7b) between the second intake valve (9b) and the opening/closing valve (14). As a result, it is possible to supply compressed gas stored inside the intake port to a combustion chamber in an early stage of the intake stroke while achieving a reduction in engine size and suppressing manufacturing cost as much as possible.
Inventors:
TADA ATSUSHI (JP)
Application Number:
PCT/JP2017/023875
Publication Date:
March 15, 2018
Filing Date:
June 29, 2017
Export Citation:
Assignee:
YAMAHA MOTOR CO LTD (JP)
International Classes:
F02D13/02; F02D41/02; F02D41/04
Foreign References:
| JPH0953455A | 1997-02-25 | |||
| JPS59158321A | 1984-09-07 |
Attorney, Agent or Firm:
YAMAKAWA,Shigeki et al. (JP)
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