| 摘要 |
<p>PURPOSE:To improve reliability and productibility of seal structure by interposing an oil seal between the mounting hole of a head cover and the outer circumferential surface of an injection pipe nut, and interposing a dust seal between the outer circumferential of the nut and the outer wall surface of the head cover. CONSTITUTION:A cylindrical injection pipe nut 5 is provided by penetrating a head cover 2, an injection pipe 9 is penetrated on the nut 5, and the top end part thereof is connected to a nozzle holder 4. An oil seal 6 is interposed between the mounting hole 21 of the head cover 2 and the outer circumferential surface 12 of the nut 5, and a rubber made dust seal 7 is interposed between the outer circumferential surface 12 of the nut 5 and the outer wall surface 22 of the head cover 2. An annular projection part 24 is formed on the outer circumferential surface 12 of the nut 5, and an annular groove 26 which is formed on the inner circumferential end part 25 of the dust' seal 7 is engaged therewith. A lip part 27 is formed on the dust seal 7, and the lip part 27 is push-pressed on the outer wall surface 22 of the head cover 2 by elastic restoring force.</p> |
