Gears and transmission
Heavy-Duty Screw Jack Actuator (Internal Mechanism)
- Bounding box
- 178.0 × 110.0 × 625.0 mm
- Engine
- Precision B-rep
- Parameters
- 48
- Published
- August 20, 2026
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The prompt
Mechanical Assembly: Internal Mechanism for Heavy-Duty Screw Jack ActuatorTranslating Lead Screw & Clevis Top:Precision trapezoidal lead screw ($\text{Tr}36 \times 6$ profile, $36\,\text{mm}$ outer diameter, $30\,\text{mm}$ root diameter, $365\,\text{mm}$ total length).Top features a solid rod eye clevis connector with a through-bore for an $\varnothing18\,\text{mm}$ pin and an integrated keyway slot running along $255\,\text{mm}$ of the screw length for anti-rotation.Rotating Bronze Drive Nut Assembly:Internal threaded drive nut made of SAE 660 Phosphor Bronze ($60\,\text{mm}$ length, $\varnothing50\,\text{mm}$ outer diameter) with internal $\text{Tr}36 \times 6$ female threads.The outer diameter features a precision keyway and a shoulder flange to seat the main gear wheel.Gear Drive System (Worm / Bevel Option):Option A (Worm Drive): Single-thread hardened steel worm shaft ($\varnothing25\,\text{mm}$ pitch diameter) meshing orthogonally with a 30-tooth phosphor bronze worm wheel keyed directly onto the central bronze nut.Option B (90° Bevel Gear): 14-tooth input bevel pinion ($\varnothing28\,\text{mm}$) driving a 28-tooth bevel ring gear ($\varnothing56\,\text{mm}$) keyed to the rotating bronze nut.Bearing & Load Support Arrangement:Main Thrust Bearings: Top and bottom sandwich configuration using SKF 51408 Single-Direction Thrust Ball Bearings ($\varnothing40\,\text{mm}$ bore, $\varnothing90\,\text{mm}$ outer diameter, $36\,\text{mm}$ width) seated against shoulder steps on the housing body to react the $31.07\,\text{kN}$ axial thrust load.Radial Support Bearings: Deep groove ball bearings (SKF 6205, $\varnothing25 \times \varnothing52 \times 15\,\text{mm}$) guiding the input drive shaft and nut sleeve to maintain alignment under gear mesh forces.Gearbox Casing & Seals:Split-body cast housing (A356 Aluminum / Cast Iron) with internal precision bearing pockets, Circlip/retaining ring grooves, internal grease lubrication cavity, and dual-lip radial oil seals at top and bottom shaft exits.Bottom face bolts to a smooth telescoping protection tube ($\varnothing60\,\text{mm}$ OD $\times 5\,\text{mm}$ wall thickness).Step-by-Step Load Transfer Path (How it Functions)Torque Transmission:The motor turns the Input Shaft ($\varnothing12\,\text{mm}$) $\rightarrow$ drives the Worm / Bevel Pinion Gear $\rightarrow$ rotates the Bronze Nut (SAE 660) at 127.5 RPM.Axial Thrust Load Reaction:As the nut rotates, it creates a vertical lifting force ($31.07\,\text{kN}$) on the Translating Screw. The equal-and-opposite downward reaction load is transferred through the nut shoulders into the SKF 51408 Thrust Bearing and directly into the Outer Cast Housing Body.Linear Motion:Because the screw is constrained from rotating by an external pivot or internal keyway, the rotation of the bronze nut causes pure axial translation of the screw and top clevis.
Parameters
| Name | Value | Range |
|---|---|---|
| Body Width | 100 mm | 50 – 200 |
| Body Depth | 80 mm | 50 – 150 |
| Body Height | 90 mm | 60 – 150 |
| Chamfer Radius | 3 mm | 0.5 – 8 |
| Top Flange OD | 80 mm | 60 – 120 |
| Top Flange Thickness | 8 mm | 5 – 15 |
| Bolt Circle Diameter | 65 mm | 50 – 100 |
| Bolt Hole Diameter | 6.5 mm | 4 – 12 |
| Bearing Pocket Dia | 60 mm | 40 – 100 |
| Bearing Pocket Depth | 10 mm | 5 – 20 |
| Central Bore Dia | 40 mm | 20 – 80 |
| Side Ext. Dia | 30 mm | 20 – 60 |
| Side Ext. Length | 40 mm | 20 – 80 |
| Side Flange Width | 40 mm | 30 – 60 |
| Side Flange Thickness | 8 mm | 4 – 12 |
| Side Flange Bolt Hole Dia | 6.5 mm | 4 – 10 |
| Side Flange Bolt Spacing | 25 mm | 15 – 40 |
| Input Shaft Dia | 12 mm | 8 – 25 |
| Input Shaft Extension | 30 mm | 15 – 60 |
| Keyway Width | 4 mm | 3 – 8 |
| Keyway Depth | 2.5 mm | 1.5 – 4 |
| Keyway Length | 20 mm | 10 – 40 |
| Lead Screw Outer Dia | 36 mm | 20 – 50 |
| Lead Screw Root Dia | 30 mm | 15 – 40 |
| Lead Screw Total Length | 365 mm | 200 – 500 |
| Keyway Slot Length | 255 mm | 100 – 400 |
| Keyway Slot Width | 10 mm | 5 – 15 |
| Keyway Slot Depth | 5 mm | 3 – 8 |
| Clevis Pin Hole Dia | 18 mm | 10 – 25 |
| Clevis Width | 30 mm | 20 – 50 |
| Clevis Thickness | 15 mm | 10 – 25 |
| Bronze Nut OD | 50 mm | 40 – 70 |
| Bronze Nut Length | 60 mm | 40 – 80 |
| Nut Flange OD | 70 mm | 60 – 90 |
| Nut Flange Thickness | 6 mm | 4 – 10 |
| Worm Shaft Pitch Dia | 25 mm | 15 – 40 |
| Worm Shaft Length | 60 mm | 40 – 100 |
| Worm Wheel OD | 80 mm | 60 – 120 |
| Worm Wheel Thickness | 20 mm | 10 – 30 |
| Thrust Bearing Bore | 40 mm | 30 – 60 |
| Thrust Bearing OD | 90 mm | 70 – 120 |
| Thrust Bearing Width | 36 mm | 20 – 50 |
| Radial Bearing Bore | 25 mm | 15 – 40 |
| Radial Bearing OD | 52 mm | 40 – 70 |
| Radial Bearing Width | 15 mm | 10 – 25 |
| Protective Tube OD | 60 mm | 50 – 80 |
| Tube Wall Thickness | 5 mm | 3 – 10 |
| Tube Height | 200 mm | 100 – 400 |
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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