Title:
PISTON FOR ENGINE
Document Type and Number:
WIPO Patent Application WO/2021/045129
Kind Code:
A1
Abstract:
At least one of a pair of piston skirt parts (27) of a piston (25) for an engine has recesses (29) at both ends in the circumferential direction thereof, and the outer circumferential surface (28) of the piston skirt part (27) has a sliding surface (28a) as well as a stepped surface (29a) and a facing surface (29b) that form the recesses (29). The sliding surface (28a) forms an oil film between the sliding surface (28a) and the inner wall surface (15f) of a cylinder hole (17a). The stepped surface (29a) is connected to the sliding surface (28a) and constitutes a step formed at a depth at which the oil film between the sliding surface (28a) and the inner wall surface (15f) of the cylinder hole (17a) can be cut. The facing surface (29b) is connected to the stepped surface (29a) and faces the inner wall surface (15f) of the cylinder hole (17a). As a result thereof, it is possible to reduce sliding resistance when the pair of piston skirt parts (27) are deformed and increase the lengths in the circumferential direction of the outer circumferential surfaces (28) of the pair of piston skirt parts (27) and the flexibility of design of the oil film area to be secured.
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Inventors:
FUJITA HIDEYUKI (JP)
Application Number:
PCT/JP2020/033341
Publication Date:
March 11, 2021
Filing Date:
September 02, 2020
Export Citation:
Assignee:
YAMAHA MOTOR CO LTD (JP)
International Classes:
F02F3/00; F16J1/00
Foreign References:
| JPS63170556U | 1988-11-07 | |||
| JPH0989105A | 1997-03-31 | |||
| JPH0171157U | 1989-05-12 | |||
| DE102014219669A1 | 2016-03-31 |
Attorney, Agent or Firm:
KAJI, SUHARA & ASSOCIATES (JP)
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