Enclosures and housings
Four-Bar Crank-Rocker Linkage (Assembled)
- Bounding box
- 286.8 × 145.3 × 20.0 mm
- Engine
- Precision B-rep
- Parameters
- 16
- Published
- September 18, 2026
Download
Free to download and use. See the terms.
The prompt
Requirements: Distance between the two fixed pivot centers: 200 mm. The input crank must be able to rotate continuously through 360 degrees. The output rocker must oscillate through an angular range of approximately 0 to 90 degrees. Calculate and select suitable lengths for the crank and connecting rod so that the mechanism satisfies this motion requirement. All links are flat steel plates with a thickness of 5 mm. Use circular pivot holes at all joints. Keep all links in the same plane. Avoid interference or locking throughout the full crank rotation. Create separate solid bodies for: Input crank Connecting rod Output rocker Fixed base with the two pivot centers 200 mm apart Show the mechanism assembled in a valid working position. Use millimeters. Create accurate mechanical CAD geometry suitable for export as STEP.
Parameters
| Name | Value | Range |
|---|---|---|
| Ground / Pivot Spacing | 200 mm | 100 – 400 |
| Base Plate Length | 260 mm | 150 – 450 |
| Base Plate Width | 80 mm | 40 – 160 |
| Base Plate Thickness | 5 mm | 2 – 15 |
| Crank Length (a, pivot to pin) | 70 mm | 20 – 100 |
| Crank Overall Length | 90 mm | 40 – 140 |
| Crank Width | 20 mm | 10 – 40 |
| Coupler Length (b, hole-to-hole) | 194 mm | 100 – 300 |
| Coupler Overall Length | 214 mm | 120 – 340 |
| Coupler Width | 20 mm | 10 – 40 |
| Rocker Length (c, pivot to pin) | 100 mm | 40 – 160 |
| Rocker Overall Length | 120 mm | 50 – 180 |
| Rocker Width | 25 mm | 10 – 50 |
| Link Plate Thickness | 5 mm | 2 – 15 |
| Pivot Hole Diameter | 6 mm | 2 – 12 |
| Crank Angle (from +X) | 0 deg | 0 – 360 |
Every value above is a live dimension. Open a model like this in the editor and each one becomes a slider you can drag before exporting.
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