IGNITION COIL FOR INTERNAL COMBUSTION ENGINE

• Main Authors: WADA JUNICHI, SANO MASAFUYU
• Format: Patent
• Language: English; Japanese
• Published: 23.05.2016
• Subjects: BASIC ELECTRIC ELEMENTS; BLASTING; COMBUSTION ENGINES; ELECTRICITY; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; IGNITION, OTHER THAN COMPRESSION IGNITION, FORINTERNAL-COMBUSTION ENGINES; INDUCTANCES; LIGHTING; MAGNETS; MECHANICAL ENGINEERING; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES; TRANSFORMERS; WEAPONS

PROBLEM TO BE SOLVED: To provide an ignition coil for internal combustion engine which reconciles falling prevention and protection of a resistor, while reducing voids in resin in a high voltage tower part.SOLUTION: Internal diameter of the proximal end side portion 332 of a tower insertion hole 33 is larger than the external diameter at the maximum external diameter portion of a resistor 5. Internal diameter of the distal end side portion 331 of the tower insertion hole 33 is larger than the external diameter of the proximal end side portion of a coil spring, and equal to or less than the external diameter at the maximum external diameter portion of the resistor 5. An ignition coil is configured so that the maximum external diameter portion of the resistor 5 is received by the distal end side portion 331 of the tower insertion hole 33, and a clearance S is formed between the resistor 5 and a high voltage cap 6, in a state where the coil spring is drawn out from the tower insertion hole 33.SELECTED DRAWING: Figure 3 【課題】抵抗体の脱落防止及び抵抗体の保護を両立し、かつ、高圧タワー部における樹脂内ボイドを低減する内燃機関用点火コイルを提供する。【解決手段】タワー挿通穴３３の基端側部分３３２の内径は、抵抗体５の最大外径部の外径よりも大きくなっている。タワー挿通穴３３の先端側部分３３１の内径は、コイルスプリングの基端側部分の外径よりも大きく、かつ抵抗体５の最大外径部の外径以下になっている。点火コイルは、コイルスプリングがタワー挿通穴３３から抜き出された状態において、タワー挿通穴３３の先端側部分３３１によって抵抗体５の最大外径部が受け止められるとともに、抵抗体５と高圧キャップ６との間に隙間Ｓが形成されるよう構成される。【選択図】図３