Enclosures and housings
Otto Engine Piston — Ø85 AlSi Alloy
- Bounding box
- 84.9 × 84.9 × 85.0 mm
- Engine
- Precision B-rep
- Parameters
- 16
- Published
- November 13, 2026
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The prompt
Create a 2D mechanical engineering drawing of an internal combustion Otto engine piston made of AlSi alloy. The drawing must follow ISO technical drawing standards like ISO 129. Use ISOCPEUR or ISOCTEUR standard italic fonts for labels and dimensions. Main views and general layout: Front view: A half section front view of the piston. Dimensions on the main view: Total piston height: 85 mm. Nominal piston diameter at the top: diameter 85 mm. Profiled piston diameters due to thermal expansion from top to bottom: diameter 84.69 mm, diameter 84.79 mm, diameter 84.92 mm at the bottom of the skirt. Groove diameter of the top two compression rings: Dhr equals diameter 78.38 mm. Groove diameter of the bottom oil control ring: Dhr equals diameter 75.52 mm. Surface roughness on the main view: On the piston crown or top surface: Ra 3.2. On the internal curve and bottom of the piston skirt: Ra 3.2. At the ring grooves: Ra 0.8. Detail view reference: Circle the right ring zone with a continuous thin line and label it with the letter A for the detail view. DETAIL A or Magnified view of the ring zone: Label: DETAIL A, Scale 5:1 placed directly below the detail view. Geometry and height dimensions: Top land height representing the solid part between the piston crown and the first ring groove: 10.75 mm. First compression ring groove height: 1.79 mm. Ring land height between the first and second compression rings: 0.8 mm. Second compression ring groove height: 1.79 mm. Ring land height between the second compression ring and the oil control ring: 0.8 mm. Bottom oil control ring groove height: 2.81 mm. Tolerances and fits on the detail view: Include the H7, g6 clearance fit designation at the groove dimension lines. Additional callout on the detail view: Include a text callout with a leader line pointing to the grooves: v / h equals 1.4. Formatting and dimensioning rules strictly enforced: Dimensioning tight spaces: For the 0.8 mm height dimensions of the ring lands, the dimension line arrows must be placed OUTSIDE the extension lines and point INWARDS towards each other so they do not overlap. Title block: In the bottom right corner. It must contain the following text in Hungarian: Otto motor dugattyú és gyűrűk, Anyag: AlSi ötvözet, Tömeg: 0.533 kg, Méretarány: 1:1.
Parameters
| Name | Value | Range |
|---|---|---|
| Total piston height | 85 mm | 60 – 120 |
| Nominal piston diameter | 85 mm | 60 – 120 |
| Profiled Ø — top land (cold, smallest) | 84.69 mm | 50 – 120 |
| Profiled Ø — ring belt | 84.79 mm | 50 – 120 |
| Profiled Ø — skirt bottom | 84.92 mm | 50 – 120 |
| Compression ring groove Ø Dhr | 78.38 mm | 55 – 95 |
| Oil control ring groove Ø Dhr | 75.52 mm | 55 – 95 |
| Top land height | 10.75 mm | 4 – 25 |
| Compression ring groove height | 1.79 mm | 0.8 – 5 |
| Ring land height (0.8 mm) | 0.8 mm | 0.3 – 4 |
| Oil control ring groove height | 2.81 mm | 1 – 6 |
| Crown thickness (top to cavity) | 8 mm | 4 – 20 |
| Skirt wall thickness | 7 mm | 4 – 12 |
| Gudgeon pin bore Ø | 22 mm | 10 – 40 |
| Pin boss Ø | 34 mm | 20 – 55 |
| Pin axis height above skirt end | 45 mm | 20 – 70 |
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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