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US 4,796,517 AGranted
Metal piston and ceramic piston pin assembly
AssigneeNgk Spark Plug Co., Ltd.
InventorsShigeaki Akao, Mitsuyoshi Kawamura, Takio Kojima
Life of this patent
Estimating the term…
Abstract
A piston pin made of ceramics is journalled in piston bosses of a piston made of aluminium alloy. Intermediate members are installed in bearing bores to receive therein terminal end portions of the piston pin. The intermediate members are made of metal which is intermediate in thermal expansion coefficient between the aluminium alloy forming the piston and the ceramics forming the piston pin.
Claims9
A piston and piston pin assembly comprising:
- a piston made of metal and having piston bosses;
- a connecting rod;
- a piston pin connected to the rod and made of ceramics, said pin being journalled in said piston bosses and having axially opposed terminal ends;
- retaining means for retaining said pins in said bosses;
- intermediate ring members in abutment with said retaining means and remote from said rod interposed between said terminal ends of said ceramic piston pin and said piston bosses, said intermediate members being made of metal which is intermediate in thermal expansion coefficient between the metal forming said piston and the ceramics forming said piston pin;
- and
- said piston having a piston head, said intermediate members being formed integral with said piston head.
4 more elements
A piston and piston pin assembly comprising:
- a piston made of metal and having piston bosses;
- a connecting rod;
- a piston pin connected to the rod and made of ceramics, said pin being journalled in said piston bosses and having axially opposed terminal ends;
- retaining means for retaining said pins in said bosses;
- intermediate ring members in abutment with said retaining means and remote from said rod interposed between said terminal ends of said ceramic piston pin and said piston bosses, said intermediate members being made of metal which is intermediate in thermal expansion coefficient between the metal forming said piston and the ceramics forming said piston pin;
- and
- said piston having a piston head circumferential wall portion, said intermediate members being formed integral with said piston head circumferential wall portion.
4 more elements
A piston and piston pin assembly comprising:
- a piston made of metal and having piston bosses;
- a connecting rod;
- a piston pin connected to the rod made of ceramics, said pin being journalled in said piston bosses and having axially opposed terminal ends;
- retaining means for retaining said pins in said bosses;
- ring-shaped intermediate members in abutment with said retaining means and remote from said rod made of metal and installed in said piston bosses receiving therein said terminal ends of said piston pin;
- said piston having different material sections, a first section made of the same metal as said intermediate members and formed integral therewith and a second section made of aluminum alloy;
- the metal forming said first section of said piston and said intermediate members being intermediate in thermal expansion coefficient between the aluminum alloy forming said second section of said piston and the ceramics forming said piston pin;
- and
- said first section of said piston including a circular head portion.
6 more elements
Dependencies are inferred from the claim text.