Gears and transmission
3-Axle Hydraulic Gooseneck Lowbed Semi-Trailer
- Bounding box
- 18045.0 × 6000.0 × 3931.1 mm
- Engine
- Precision B-rep
- Parameters
- 70
- Published
- November 3, 2026
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The prompt
Create a parametric 3D CAD model of a 3-axle hydraulic gooseneck lowbed semi-trailer (heavy equipment hauler). Units: millimeters. Coordinate system: X = length (X=0 at the front tip of the gooseneck, increasing toward the rear), Y = width (centered at Y=0), Z = height (Z=0 = ground). Expose all dimensions below as editable parameters. 1. GOOSENECK (upper deck) - Length 3360, width 2600, top surface at Z=1520, box section 450 deep (underside at Z=1070). - Front face with 45° chamfered lower corners. - King pin: cylinder Ø50.8, 80 long, pointing down from the underside at X=900, Y=0. - Two landing gear legs (square tube 120x120) under the gooseneck at X=2900, Y=±900, reaching down to Z=0 with 250x250 foot pads. 2. NECK (drop section) - From X=3360 to X=4160 (800 long). Vertical/inclined box structure, width 2600, connecting the gooseneck underside down to the main deck. Add a slight 15° slope on the rear face. 3. MAIN LOW DECK (well deck) - From X=4160 to X=12520 (length 8360), width 3000. - Deck top height: Z=780 at the front end, Z=830 at mid-length, Z=880 at the rear end (straight slope). - Deck plate thickness 20. - Two longitudinal main I-beams under the deck at Y=±500, depth 450, flange width 200. - Side outer rails 150x200 along both edges, with triangular outrigger crossmembers every 600 along the length connecting the main beams to the side rails. - Deck surface made of longitudinal planks 150 wide with 10 gaps. 4. TRANSITION RAMP - From X=12520 to X=13120 (600 long), sloped plate rising from Z=880 to Z=1300, width 3000. 5. REAR BOGIE DECK - From X=13120 to X=17970 (length 4850), top surface at Z=1300, width 3000, thickness 350. - Central spine 1200 wide running the full length. - Three transverse beams (cross arms) extending to the full 3000 width at each axle position, creating 6 rectangular wheel cutouts (3 per side) between them, similar to a comb shape seen from above. 6. AXLES AND WHEELS - 3 axles, spacing 1520, centered in the rear bogie deck (axle X positions: 14025, 15545, 17065). Axle center height Z=525, axle tube Ø130. - Dual wheels on each side of each axle (12 tires total): tire Ø1050, width 280, dual spacing 330 between tire centerlines; outer tire face at Y=±1450. Rim Ø572 (22.5") with a 40 deep recess. - Leaf spring suspension blocks 100x80x900 above each axle at Y=±700. 7. HYDRAULIC REAR RAMPS - Two loading ramps hinged at the rear end (X=17970, Z=1300), each 2800 long, 900 wide, 150 thick, centered at Y=±850. - Shown raised at 70° from horizontal, tilted toward the front. - Each ramp is a ladder frame: two side rails 150x150 with rungs 60x60 every 250. - One hydraulic cylinder per ramp: barrel Ø100, rod Ø60, from the deck at X=17200 to the ramp at 1/3 of its length. 8. DETAILS - Rear bumper 3000 x 150 x 200 at X=17970, Z=1050. - All structural edges with 5 chamfers. Overall length ≈17970. Output as solid body, exportable to STEP.
Parameters
| Name | Value | Range |
|---|---|---|
| Gooseneck Length | 3360 mm | 2500 – 4000 |
| Gooseneck Width | 2600 mm | 2000 – 3000 |
| Gooseneck Depth (Height) | 450 mm | 300 – 600 |
| Gooseneck Top Z | 1520 mm | 1300 – 1800 |
| Front Lower Corner Chamfer | 80 mm | 10 – 200 |
| King Pin Diameter | 50.8 mm | 30 – 80 |
| King Pin Length | 80 mm | 50 – 120 |
| King Pin X Position | 900 mm | 500 – 1500 |
| Landing Leg X Position | 2900 mm | 2500 – 3200 |
| Landing Leg Y Offset | 900 mm | 700 – 1200 |
| Landing Leg Tube Size | 120 mm | 80 – 200 |
| Foot Pad Size | 250 mm | 150 – 350 |
| Foot Pad Thickness | 20 mm | 10 – 40 |
| Neck Drop Length (X) | 800 mm | 500 – 1200 |
| Neck Width | 2600 mm | 2000 – 3000 |
| Neck Rear Face Slope Angle | 15 deg | 5 – 30 |
| Main Deck Front X | 4160 mm | 3500 – 5000 |
| Main Deck Length | 8360 mm | 5000 – 10000 |
| Main Deck Width | 3000 mm | 2500 – 3500 |
| Deck Front Top Z | 780 mm | 600 – 900 |
| Deck Rear Top Z | 880 mm | 700 – 1000 |
| Deck Plate Thickness | 20 mm | 10 – 40 |
| I-Beam Depth | 450 mm | 300 – 600 |
| I-Beam Flange Width | 200 mm | 120 – 300 |
| Side Rail Width (Y) | 150 mm | 100 – 250 |
| Side Rail Height (Z) | 200 mm | 120 – 300 |
| Transition Ramp Length | 600 mm | 400 – 1000 |
| Transition Ramp Width | 3000 mm | 2500 – 3500 |
| Transition Ramp Front Z | 880 mm | 700 – 1000 |
| Transition Ramp Rear Z | 1300 mm | 1100 – 1500 |
| Rear Bogie Deck Length | 4850 mm | 3000 – 6000 |
| Rear Bogie Deck Width | 3000 mm | 2500 – 3500 |
| Rear Bogie Deck Top Z | 1300 mm | 1100 – 1500 |
| Rear Bogie Deck Thickness | 350 mm | 200 – 500 |
| Central Spine Width | 1200 mm | 800 – 1600 |
| Cross Arm Length (X) | 600 mm | 400 – 1000 |
| Axle Spacing | 1520 mm | 1200 – 2000 |
| First Axle X Position | 14025 mm | 13000 – 15000 |
| Axle Tube Diameter | 130 mm | 80 – 200 |
| Axle Center Z | 525 mm | 400 – 700 |
| Axle Tube Length | 3000 mm | 2500 – 3500 |
| Spring Block Length (X) | 100 mm | 60 – 200 |
| Spring Block Width (Y) | 900 mm | 500 – 1200 |
| Spring Block Height (Z) | 80 mm | 40 – 150 |
| Spring Block Y Offset | 700 mm | 500 – 900 |
| Tire Diameter | 1050 mm | 800 – 1300 |
| Tire Width | 280 mm | 200 – 400 |
| Rim Hole Diameter | 572 mm | 400 – 700 |
| Dual Wheel Spacing | 330 mm | 250 – 450 |
| Outer Tire Face Y | 1450 mm | 1200 – 1700 |
| Ramp Length | 2800 mm | 2000 – 3500 |
| Ramp Width | 900 mm | 600 – 1200 |
| Ramp Thickness | 150 mm | 100 – 250 |
| Ramp Hinge X | 17970 mm | 17500 – 18500 |
| Ramp Hinge Z | 1300 mm | 1100 – 1500 |
| Ramp Y Offsets (comma-separated) | — | — |
| Ramp Angle from Horizontal | 70 deg | 30 – 85 |
| Ramp Side Rail Size | 150 mm | 80 – 250 |
| Ramp Rung Size | 60 mm | 30 – 100 |
| Rung Spacing | 250 mm | 150 – 400 |
| Hydraulic Barrel Diameter | 100 mm | 50 – 150 |
| Hydraulic Rod Diameter | 60 mm | 30 – 90 |
| Hydraulic Barrel Length | 800 mm | 400 – 1500 |
| Hydraulic Rod Length | 500 mm | 200 – 1000 |
| Hydraulic Deck Mount X | 17200 mm | 16500 – 17800 |
| Bumper Length (Y) | 3000 mm | 2500 – 3500 |
| Bumper Width (X) | 150 mm | 100 – 250 |
| Bumper Height (Z) | 200 mm | 100 – 300 |
| Bumper Z Center | 1050 mm | 850 – 1250 |
| Bumper X Position | 17970 mm | 17500 – 18500 |
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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