Rocker-arm valve train
CADlingo generated this model from the prompt below. Open it in the studio to inspect it in 3D, view sections and try its dimension controls.
The prompt
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.
Model facts
- Overall size
- 120 × 60 × 118 mm
- Bodies
- 7
- Volume
- 123.6 cm³
- Adjustable in the studio
- 1 dimension
