JP2003278567A5 - - Google Patents

Description

ケーシング９８は、ブラケット９６に取付けられる椀状の第１ケース半体１０４と、該ケース半体１０４にかしめ結合される椀状の第２ケース半体１０５とから成り、ダイヤフラム９９の周縁部は両ケース半体１０４，１０５の開口端部間に挟持される。また負圧室１０２はダイヤフラム９９および第２ケース半体１０５間に形成され、この負圧室１０２にばね１００が収容される。 The casing 98 comprises a first case half 104 shaped like a bowl attached to the bracket 96 and a second case half 105 like a wedge shaped to be crimped to the case half 104, and the peripheral portion of the diaphragm 99 is both It is held between the open ends of the case halves 104 and 105. The negative pressure chamber 102 is formed between the diaphragm 99 and the second case half 105, and the spring 100 is accommodated in the negative pressure chamber 102.

したがってエンジンの軽負荷時には小排気量、高圧縮比の運転とすることで高熱効率化を図り、図１０の実線で示すように破線で示す従来のものに比べて図示燃料消費率を低下させ、燃費の低減を図ることが可能となる。また高負荷時には大排気量、低圧縮比とすることで爆発荷重および筒内圧力が過度に上昇しないようにして騒音および強度の問題が生じるのを回避することができる。 Therefore, when the engine is lightly loaded, thermal efficiency can be improved by operating with a small displacement and high compression ratio, and the illustrated fuel consumption rate can be reduced compared to the conventional one shown by the broken line as shown by the solid line in FIG. It is possible to reduce fuel consumption. Also, by setting a large displacement and a low compression ratio at high load, it is possible to prevent the occurrence of noise and strength problems by preventing the explosion load and the pressure in the cylinder from excessively increasing.

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