Gears and transmission
Two-Stage Compound Spur Gearbox (Exploded Part Set)
- Bounding box
- 4059.8 × 300.0 × 102.5 mm
- Engine
- Precision B-rep
- Parameters
- 55
- Published
- September 25, 2026
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The prompt
Create a **parametric 3D CAD model of a two-stage compound spur gearbox**. Use four module-2, 20° pressure-angle spur gears arranged **116T→31T and 116T→31T**, with **20 mm face width** and **147 mm shaft centre distance**. Input speed is **900 rpm**, output speed **12,601.87 rpm**, output power **1.2 kW**. Use three parallel shafts with input/output axes collinear. Design the **countershaft as Ø20 × 98 mm AISI 1040 steel**, with two **6204 bearings (20×47×14 mm)**, two **6×6×18 mm keys**, removable Ø30×Ø20×5 mm collars, a 10 mm central spacer, and end retaining rings. Create a **two-piece horizontally split, base-mounted housing** with four mounting holes, 8 mm preliminary walls, minimum 10 mm gear clearance, oil sump, fill/drain/level plugs, breather and shaft seals. Ensure practical assembly/disassembly, no component interference, and generate separate parts plus a complete gearbox assembly.
Parameters
| Name | Value | Range |
|---|---|---|
| Exploded Layout Gap | 60 mm | 10 – 200 |
| Housing Length | 420 mm | 200 – 800 |
| Housing Width | 260 mm | 120 – 500 |
| Wall Thickness | 8 mm | 4 – 20 |
| Lower Half Height | 90 mm | 40 – 200 |
| Upper Cover Height | 70 mm | 30 – 200 |
| Oil Sump Depth | 16 mm | 0 – 60 |
| Sump Side Margin | 20 mm | 5 – 80 |
| Base / Flange Overhang | 20 mm | 5 – 60 |
| Base Flange Thickness | 12 mm | 4 – 30 |
| Mounting Hole Dia | 14 mm | 5 – 30 |
| Split Flange Thickness | 12 mm | 5 – 30 |
| Split Bolt Count | 8 off | 2 – 16 |
| Split Bolt Hole Dia | 11 mm | 4 – 20 |
| Breather / Fill Boss Dia | 32 mm | 10 – 60 |
| Boss Height | 16 mm | 5 – 40 |
| Boss Bore Dia | 12 mm | 4 – 30 |
| Shaft Centre Distance | 147 mm | 60 – 300 |
| I/O Bearing Bore | 52 mm | 20 – 120 |
| Countershaft Bearing Bore | 47 mm | 20 – 120 |
| Input / Output Shaft Dia | 25 mm | 10 – 60 |
| Input / Output Shaft Length | 120 mm | 40 – 300 |
| Seal Land Dia | 22 mm | 8 – 60 |
| Seal Land Length | 15 mm | 3 – 60 |
| Countershaft Dia | 20 mm | 8 – 60 |
| Countershaft Length | 98 mm | 40 – 300 |
| Gear Module | 2 mm | 0.5 – 6 |
| Large Gear Teeth | 116 off | 20 – 200 |
| Pinion Teeth | 31 off | 10 – 120 |
| Face Width | 20 mm | 5 – 60 |
| 116T Gear Bore | 25 mm | 5 – 60 |
| 31T Gear Bore | 20 mm | 5 – 60 |
| Key Length | 18 mm | 6 – 60 |
| Key Width | 6 mm | 2 – 20 |
| Key Height | 6 mm | 2 – 20 |
| Keyway Depth | 3.5 mm | 0.5 – 8 |
| 6204 Bearing OD | 47 mm | 20 – 120 |
| 6204 Bearing Bore | 20 mm | 6 – 60 |
| 6204 Bearing Width | 14 mm | 4 – 40 |
| I/O Bearing OD | 52 mm | 20 – 140 |
| I/O Bearing Bore | 25 mm | 6 – 60 |
| I/O Bearing Width | 15 mm | 4 – 40 |
| Collar OD | 30 mm | 12 – 80 |
| Collar ID | 20 mm | 6 – 60 |
| Collar Width | 5 mm | 2 – 20 |
| Central Spacer Length | 10 mm | 3 – 40 |
| Retaining Ring OD | 24 mm | 10 – 60 |
| Retaining Ring Thickness | 1.5 mm | 0.5 – 6 |
| Lip Seal OD | 47 mm | 15 – 120 |
| Lip Seal Bore | 25 mm | 5 – 80 |
| Lip Seal Width | 7 mm | 3 – 25 |
| Plug Thread Dia | 12 mm | 6 – 30 |
| Plug Thread Length | 12 mm | 5 – 40 |
| Plug Hex Head Dia | 19 mm | 8 – 45 |
| Plug Head Height | 8 mm | 3 – 30 |
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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