ロッカーアーム動弁機構

プロンプト

Model a rocker-arm valve train as seven separate solids: pedestal, rocker shaft, rocker arm, valve, spring retainer, valve spring, pushrod. Frame: the rocker shaft axis is parallel to Y through X=0, Z=60; Z is up. Pedestal (one solid): base plate X=-60..60, Y=-30..30, Z=-8..0; two cheeks X=-12..12, Z=0..70, at Y=15..25 and Y=-25..-15, each with a Ø16 hole on the shaft axis. The base plate has a Ø8 hole for the valve stem and a Ø10 clearance hole for the pushrod (axes below), both through along Z. Rocker shaft: Ø16 along Y from Y=-30 to Y=30. Rocker arm (one solid, Y=-7..7), defined in an arm frame with origin on the shaft axis, arm x along the arm and arm z across it: a hub Ø28 with a Ø16 bore on the shaft, united with a beam x=-30..40, z=-6..6. The arm is rotated about the shaft axis by 8° so that its +X end goes DOWN: arm x = (cos8°, 0, -sin8°), arm z = (sin8°, 0, cos8°). Valve (one solid): vertical stem Ø8 whose axis is X=34.258, Y=0, from Z=-40 up to Z=45.087, capped by a hemisphere R4 centred at (34.258, 0, 45.087); this tip touches the arm's lower face (arm z=-6) at arm x=36. Head: disc Ø28 from Z=-44 to Z=-40. Spring retainer: disc Ø24, bore Ø8, Z=20..24 on the valve axis. Valve spring: round wire Ø2.5 swept along a helix around the valve axis, coil radius 9, right-hand, 4 turns from Z=1.25 to Z=18.75 (pitch 4.375), starting on the +X side of the valve axis; it rests on the base plate (Z=0) and touches the retainer (Z=20). Pushrod (one solid): vertical rod Ø6 with axis X=-25.158, Y=0, from Z=-40 up to Z=53.437, with a ball Ø8 centred at (-25.158, 0, 53.437); the ball touches the arm's lower face at arm x=-24.

モデル情報

全体サイズ

120 × 60 × 118 mm

ボディ数

7

体積

123.6 cm³

スタジオで調整可能

1個の寸法