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WPKZ Hollow Shaft Vertical Output Single Speed Worm Gear Reducer — Coupling-Free Direct-Mount for Auger, Spiral, & Vertical Screw Drives
The most challenging drive integration scenario in screw conveyor and auger machine design combines two requirements simultaneously: an upward-pointing output shaft (to drive the screw directly without right-angle gearing) and a hollow bore output (to mount the gearbox directly onto the screw shaft without a separate coupling). The WPKZ hollow shaft vertical output worm gear reducer is the purpose-engineered solution that satisfies both requirements in a single compact cast iron unit.
By combining the vertical output geometry of the WPZ with the H7 precision hollow bore of the WPKZ, this gearbox delivers a vertical, coupling-free direct shaft mount that eliminates both angle drive accessories and output couplings from the drive arrangement — the most compact and lowest-part-count vertical screw drive solution available. Available in 7 frame sizes (50–135 mm) with ratios 1/5 to 1/60. O Ever-power | Uzyskaj wycenę
Technical Specifications
WPKZ dimensional data. S = hollow bore diameter (output bore); W×Y = bore keyway dimensions. E₁, E₂ = output shaft extension above/below housing. Input shaft is horizontal. All dimensions in mm; reference input speed 1500 r/min.
| Size | Ratio | AB | LL | B | BB | CC | E₁ | E₂ | F | G | M | N | Z | HS | U | T×V | S(bore) | W×Y(keyway) | Wt(kg) | Oil(L) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 50 | 1/5–1/60 | 108 | 77 | 150 | 97 | 50 | 53 | 77 | 100 | 15 | 125 | 160 | 11 | 30 | 12 | 4×2.5 | 20 | 6×22.8 | 8 | 0.4 |
| 60 | 1/10–1/60 | 120 | 82 | 168 | 112 | 60 | 68 | 92 | 100 | 15 | 130 | 190 | 11 | 40 | 15 | 5×3 | 25 | 8×28.3 | 10.5 | 0.5 |
| 70 | 140 | 95 | 194 | 131 | 70 | 75 | 115 | 120 | 20 | 155 | 230 | 15 | 40 | 18 | 5×3 | 30 | 8×33.3 | 15 | 0.6 | |
| 80 | 160 | 100 | 214 | 142 | 80 | 96 | 144 | 125 | 20 | 160 | 265 | 15 | 50 | 22 | 7×4 | 35 | 10×38.3 | 20 | 1.1 | |
| 100 | 190 | 135 | 254 | 169 | 100 | 100 | 150 | 155 | 22 | 196 | 310 | 15 | 50 | 25 | 7×4 | 40 | 12×43.3 | 35 | 1.5 | |
| 120 | 219 | 160 | 282 | 190 | 120 | 120 | 180 | 180 | 28 | 230 | 360 | 18 | 65 | 30 | 7×4 | 45 | 14×48.8 | 60 | 4 | |
| 135 | 249 | 170 | 317 | 210 | 135 | 130 | 200 | 200 | 30 | 250 | 410 | 18 | 75 | 35 | 10×4.5 | 60 | 18×64.4 | 80 | 5.2 |
* WPKZ available in sizes 50–135. S = hollow bore diameter matching driven screw shaft. Bore tolerance H7; driven shaft should be h6 or js6. Three input shaft direction positions (A, B, C).
Product Structure — Hollow Bore + Vertical Output
The WPKZ combines the vertical-output housing geometry of the WPZ with a through-bored worm wheel shaft. The hollow bore exits through the top of the housing, allowing the driven screw or auger shaft to pass up through the gearbox and be directly driven without any coupling element. The flat base bolts directly to the conveyor trough or auger frame for the most compact possible vertical screw drive assembly.
| Output | Vertical hollow bore H7 through worm wheel shaft — screw shaft slides directly in |
| Bore Size | 20 mm (size 50) to 60 mm (size 135) — matches standard screw conveyor shaft sizes |
| Housing | FC25 cast iron upright block with flat base — bolts directly to conveyor frame |
| Input Shaft | Horizontal solid shaft with keyway; 3 direction positions (A, B, C) |
| Lubrication | Designed for vertical-output orientation; top-face oil fill and breather |
| Self-Locking | Available at ratios ≥1/30 — prevents back-feeding and gravity-driven reversal |
✅ Key Features & Benefits
Vertical Hollow Bore — No Angle Drive, No Coupling
The WPKZ combines two output features in one unit: vertical output direction AND hollow bore shaft mounting. The result is a drive arrangement that requires no right-angle bevel drive, no separate coupling, and no adapter hub — reducing the screw conveyor or auger drive assembly to its theoretical minimum part count. Keywords: hollow shaft vertical worm gearbox, auger drive worm reducer.
Direct Screw Shaft Integration
The precision H7 hollow bore accepts the screw or auger shaft directly. The shaft passes through the bore from below, is located radially by the bore and rotationally by the keyway, and is retained axially by a set screw or shrink disc. The entire drive assembly — gearbox body, screw shaft, and screw blade — becomes a single rigid, compact unit.
Self-Locking for Gravity Back-Feed Prevention
At ratios of 1/30 and above, the WPKZ worm gearing self-locks under static conditions, preventing the screw from back-feeding under gravity load when the motor stops. For bulk powder and grain handling applications, this prevents material spillage and simplifies the control system by removing the need for a separate load-holding brake on light-duty applications.
Flat-Base Direct-Mount to Conveyor Frame
The WPKZ flat base bolts directly to the conveyor trough end plate or auger drive flange without adapter brackets or spacers. This produces the most compact possible drive head assembly — important for mobile agricultural machinery and tight-clearance industrial installations where every millimetre of vertical height matters.
Same Geometry as WPZ — Same Footprint
The WPKZ shares the identical housing dimensions with the WPZ solid-shaft version. If an existing WPZ installation needs to be upgraded to a hollow bore output (for example, because the shaft coupling is being eliminated), the WPKZ is a direct dimensional replacement with no frame or motor changes required.
7 Frame Sizes — Full Screw Drive Coverage
Bore diameters from 20 mm (size 50) to 60 mm (size 135) cover the standard shaft diameters of small-to-medium screw conveyors and auger machines. Nine ratios (1/5–1/60) provide output speed flexibility from light rapid feeding to heavy slow-turn applications.
Industry Applications
The WPKZ is specified for screw conveyor, auger, and agitator applications requiring the absolute minimum-part-count vertical hollow-bore drive:
Vertical Screw ConveyorsVertical screw conveyors for grain, flour, powders, and plastic pellets where the WPKZ mounts directly at the base of the vertical screw tube, connecting to the screw shaft without angle drives.
Spiral Feeders & Dosing ScrewsPharmaceutical, food, and chemical dosing screws requiring precise, low-speed hollow-shaft drive with compact footprint in clean-room or process vessel head designs.
Concrete & Dry Mortar PlantsVertical cement screw conveyor drives and dry mortar mixing plant feed screw drives where the WPKZ compact hollow-bore vertical drive simplifies the conveyor drive head assembly.
Agricultural Auger DrivesMobile grain auger and seed treatment machine drives where compact, direct-shaft hollow bore vertical gearboxes reduce machine width and simplify seasonal field maintenance.
Chemical Agitator Drive HeadsCompact reactor vessel top-entry agitator drives where the hollow shaft accepts the agitator shaft directly and the flat gearbox base mounts to the vessel nozzle flange.
Aquaculture Feed ScrewsVertical feed auger drives in fish farm feeding systems and shrimp hatchery pellet feeders requiring minimal footprint hollow-shaft direct drive in outdoor wet environments.
Quality Control & Certification
ISO 9001:2015 & CE
Full ISO 9001:2015 QMS with CE Declaration of Conformity per shipment. Hollow bore verified to H7 tolerance by calibrated plug gauge; units run-tested in vertical-output orientation as standard, not translated from horizontal test data.
Bore + Vertical Run Test
Each WPKZ undergoes: (1) hollow bore plug gauge measurement to H7, (2) bore-to-output-centreline concentricity check (≤0.05 mm TIR), and (3) 30-minute run test in vertical-output orientation. All three must pass before shipment approval.
Material Standards
Housing: FC25 cast iron (≥250 MPa). Worm: 20CrMnTi (≥58 HRC). Wheel: ZCuSn10Pb1 tin-bronze. Third-party SGS or BV inspection available on request for food, grain, and aquaculture industry compliance requirements.
Why Choose Ever-power for WPKZ Gearboxes
We supply WPKZ hollow shaft vertical output gearboxes to agricultural machinery OEMs, conveyor equipment builders, and pharmaceutical agitator manufacturers in the Netherlands, Brazil, India, Australia, and over 60 countries worldwide. Our combined hollow bore grinding and vertical orientation test capabilities make us one of the few manufacturers in the world that validates the WPKZ in its actual operating orientation before shipment.
- ✅ Triple-stage inspection — bore tolerance, concentricity, and vertical run test
- ✅ Custom bore diameters for non-standard screw shaft sizes
- ✅ Shrink disc option available for high-torque or reversing screw applications
- ✅ Agricultural and food industry documentation on request
- ✅ 20+ years export experience — Netherlands, Brazil, India, Australia and beyond
⭐ Customer Reviews
“We use WPKZ units on our mobile grain auger drives. The hollow shaft vertical output connects directly to the auger shaft — no coupling, no right-angle drive, and the flat base bolts straight to the auger trough frame. Our machine assembly time dropped by 40% compared to our previous solution. Excellent product.”
William P., Design Engineer
Agricultural Machinery OEM, Victoria, Australia
“We specified WPKZ-80 for vertical screw conveyor drives in a powder processing plant. The hollow bore accepts our standard 35mm screw shaft directly, and the self-locking at 1/40 ratio prevents back-feeding when the system stops. Bore dimensions are exactly H7 as specified — no reaming needed on-site.”
Jan V., Mechanical Engineer
Conveyor Systems Builder, Amsterdam, Netherlands
“We use WPKZ gearboxes on our dosing screw drives in a food production facility. The compact hollow bore vertical design fits neatly into our machine without any angle drives. Performance is excellent — reliable, quiet, and the bore fit is perfect on our 25mm stainless shafts. Would recommend highly.”
Carlos A., Applications Engineer
Food Processing Equipment, Campinas, Brazil
“WPKZ-100 units for vertical agitator drives in our chemical plant. The hollow bore mounts directly to the agitator shaft, which significantly simplified our vessel top-entry design. One unit had a slight finish difference on the bore but was within H7 tolerance. Overall very satisfied with quality and delivery.”
Rajesh K., Project Manager
Chemical Plant Equipment, Pune, India
❓ Frequently Asked Questions
What is the difference between WPKZ and WPZ?
The WPKZ and WPZ are identical in housing dimensions, input shaft dimensions, gear ratios, and torque ratings. The sole structural difference is the output: the WPZ has a solid vertical output shaft with external keyway; the WPKZ has a hollow vertical output bore with internal keyway. Choose WPZ when you have a separate coupling from the gearbox output to the screw shaft; choose WPKZ when you want to mount the gearbox directly onto the screw shaft without any coupling.
What hollow bore sizes are available for the WPKZ?
Standard hollow bore diameters range from 20 mm (size 50) to 60 mm (size 135), corresponding to the most common screw conveyor and auger shaft diameters. Custom bore diameters between standard sizes are available for OEM orders (e.g. a 32 mm bore in size 80) — contact us with your shaft diameter and we will confirm availability and price.
How is the driven shaft retained axially in the WPKZ hollow bore?
Standard supply includes a set screw that engages the bore keyway to prevent the shaft from pulling out axially. For applications with significant axial thrust loads (vertical conveyors handling heavy bulk materials) or reversing duty, we recommend upgrading to the optional shrink disc configuration which clamps the bore onto the shaft by interference — providing much higher axial and torsional holding capacity.
Can the WPKZ hollow bore accept a shaft that is longer than the bore depth?
Yes — the hollow bore is a through-bore, meaning a shaft can pass completely through the gearbox body if required. This is useful for long conveyor shafts that extend beyond the gearbox. The shaft length above and below the gearbox is unrestricted as long as the shaft does not contact internal gear components (the keyway engagement length is the only mechanical constraint).
What lubrication is required for the WPKZ in vertical operation?
The WPKZ is designed specifically for vertical-output operation, with oil fill and drain plugs on the top face and a breather in the correct position for this orientation. Fill with ISO VG 320 mineral gear oil to the level marked on the housing — do not use WPA/WPS horizontal fill level guidance. Change oil after the first 100 operating hours, then every 2,500 hours. For ambient temperatures above 40°C, upgrade to ISO VG 460 or PG synthetic as recommended.
The Simplest Vertical Screw Drive Available — Enquire Today
If you are designing a screw conveyor, auger, or vertical agitator and want to eliminate both the right-angle drive and the output coupling in one product decision, the WPKZ is the answer. Contact our engineers with your shaft diameter and torque requirement for a fast free selection.
