Spring apparatus and valve train of internal combustion engine using the same
AssigneeNHK Spring Co., Ltd.
InventorsKazuo Iwata, Takeyoshi Shimbori, Koichiro Yamada, Noritoshi Takamura
Life of this patent
Estimating the term…
Abstract
A bellows unit and a compression coil spring are located in series with each other between a first member and a second member. The bellows unit has an inner bellows, an outer bellows, and first and second end members. A sealed space is defined in the bellows unit. A compressed gas is sealed in the sealed space. The bellows unit is caused to extend and contract in the direction of an axis by the compressed gas. The sealed space contains an uncompressible liquid that can exchange heat with the gas. The liquid is an example of a heat exchange material.
Claims7
A spring apparatus comprising:
- a first member having an axis;
- a second member which reciprocates in a direction of the axis with respect to the first member;
- a bellows unit which is located between the first member and the second member, and which is configured to extend and contract in the direction of the axis, and which has a sealed space therein;
- a gas which is sealed in a compressed state in the sealed space of the bellows unit, and which serves to extend the bellows unit in the direction of the axis;
- a heat exchange liquid which is contained in the sealed space of the bellows unit, and which serves to exchange heat with the gas;
- and
- a heat exchange promoting member which has a higher thermal conductivity than the liquid, and which is located between the gas and the liquid.
A spring apparatus comprising:
- a first member having an axis;
- a second member which reciprocates in a direction of the axis with respect to the first member;
- a bellows unit which is located between the first member and the second member, and which is configured to extend and contract in the direction of the axis, and which has a sealed space therein;
- a gas which is sealed in a compressed state in the sealed space of the bellows unit, and which serves to extend the bellows unit in the direction of the axis;
- an uncompressible heat exchange material which is contained in the sealed space of the bellows unit, and which serves to exchange heat with the gas;
- and
- a compression coil spring located in series with the bellows unit between the first member and the second member.
Dependencies are inferred from the claim text.