Title:
内燃機関
Document Type and Number:
Japanese Patent JP7401328
Kind Code:
B2
Abstract:
To provide a 5-stroke internal combustion engine excellent in energy recovery efficiency.SOLUTION: An internal combustion engine is equipped with two combustion cylinders 3 and 4, and one auxiliary cylinder 5 sandwiched between them. A main piston 10 is inserted in the combustion cylinders 3 and 4, and an auxiliary piston 11 is inserted in the auxiliary cylinder 5. Combustion gas of the main piston 10 flows into the auxiliary cylinder 5 to push down the auxiliary piston 11, thereby recovering the energy of the combustion gas. While the main piston 10 is made of aluminum, the auxiliary piston 11 is made of cast iron. While the volume of the auxiliary piston 11 is decreased, a rotation balance of a crank shaft 13 is ensured. Therefore, the auxiliary piston 11 can decrease the vertical width of a sliding portion 11b to reduce sliding resistance while ensuring necessary mass. Consequently, energy recovery efficiency can be improved.SELECTED DRAWING: Figure 1
Inventors:
Hiroyuki Fujikawa
Tatsuya Ehara
Tatsuya Ehara
Application Number:
JP2020015064A
Publication Date:
December 19, 2023
Filing Date:
January 31, 2020
Export Citation:
Assignee:
Daihatsu Motor Co., Ltd.
International Classes:
F02B75/02; F01N5/00; F02B33/22; F16J1/01
Domestic Patent References:
| JP2013174215A | ||||
| JP21433C1 | ||||
| JP112255C2 | ||||
| JP56131853A | ||||
| JP63063536U |
Foreign References:
| US20020050253 |
Attorney, Agent or Firm:
Hiroyuki Nishi
Ryuichi Watanabe
Ryuichi Watanabe