Local pressure leveling design method for multi-link mechanism for variable compression ratio engine
- 提供方法
- 本サイト上にてダウンロード・閲覧可
- 形態
- 価格
- 一般価格(税込)：￥1,100 会員価格(税込)：￥880
- 文献番号
- 20239254
- 文献・情報種別
- その他の国際会議
- 掲載ページ
- 1-6(Total 6 p)
- 発行年月
- 2023年 8月
- 出版社
- (公社)自動車技術会 & SAE
- 言語
- 英語
- イベント
- 2023 P, E&L
書誌事項
| カテゴリ（英） | TL1 Power Cylinder Systems and Components 翻訳 |
|---|---|
| 著者（英） | 1) Takayoshi Furukawa, 2) Hiroki Asajima, 3) Takashi Tanabe, 4) Satoru Ookuma, 5) Kentaro Kawahara |
| 勤務先（英） | 1) Nissan motor Co., Ltd., 2) Nissan Motor Co.,Ltd., 3) Nissan Motor Co.,Ltd., 4) Nissan Motor Co.,Ltd., 5) Nissan Motor Co.,Ltd. |
| 抄録（英） | Nissan Motor Co., Ltd. has started mass production of the world's first mass-produced engine equipped with a variable compression ratio system. This engine adopt a multi-link crankshaft rotation mechanism with eccentric control shafts connected to all cylinders in order to achieve seamless and simultaneous variable compression ratio for all cylinders. In this mechanism, the part corresponding to the conventional connecting rod is divided into an upper link and a lower link, and the input load from the piston to the crankshaft is approximately doubled compared to the conventional connecting rod mechanism due to the principle of leverage.In the design of the lower link bearing, the bearing width in the direction of the crankshaft is increased in order to keep the bearing nominal surface pressure, which is an index of durability, to the same level as the conventional connecting rod bearing. Therefore, a challenge was to make the entire sliding surface uniform.Though the slit structure of the lower link sandwiching the upper link contributes to leveling the surface pressure in the circumferential direction, due to the increase in edge rigidity associated with the adoption of this technology, the problem of increased edge contact surface pressure arises.In order to solve this problem, a "local surface pressure leveling design method" is essential to prevent localized concentration of the bearing surface pressure generated by the received load. As a solution, predicting the state of the sliding surface before load input, taking into account the deformation of the housing, and prediction of local surface pressure increase at edges and oil holes by combination with slit structure by FEM/EHL.By setting the barrel shape deviation in the circumferential direction of the bearing against the barrel shape of the shaft sliding surface, the generated surface pressure in the axial direction is dispersed/reduced. 翻訳 |
