WPKA Single Speed Cast Iron Worm Gearbox — WP Series

When your driven equipment has a keyway-equipped through-shaft that needs to connect directly to a gearbox without an external coupling, conventional solid-output gearboxes force you into alignment compromises, flexible couplings, and extra shaft length. The WPKA Single Speed Hollow Shaft Cast Iron Worm Gearbox eliminates this problem entirely: the K-type hollow output bore slides directly onto the driven shaft and locks via key and keyway, creating a shaft-mounted gearbox with zero external coupling hardware. This clean mechanical integration is why the WPKA is the dominant choice for shaft-mounted conveyor head drives, mixer agitators, and rotating platform drives across global heavy industry.

✉ Request a Quote  |  About Ever-power

■ K-Type Through-Bore Output — No Coupling Required

The output is a precision-bored hollow shaft machined with H7 tolerance and a standard keyway slot. The driven shaft inserts directly, providing rigid key-and-bore torque transmission at full rated torque without any coupling hardware.

■ Torque Arm Mounting Eliminates Housing Rotation

The WPKA includes a torque arm mounting boss on the housing that accepts a standard reaction arm, preventing housing rotation when the unit is shaft-mounted. Multiple anchor point orientations accommodate various installation geometries.

■ Same FC20+ Cast Iron Strength as Solid-Output WPA

The hollow output bore does not compromise housing strength. The WPKA retains the same FC20+ cast iron housing as the WPA, providing identical impact resistance, vibration damping, and thermal stability.

■ Available in 12 Frame Sizes — 40 to 250 mm

The hollow bore diameter scales with frame size: 18.8 mm (size 40) to 90 mm (size 250), covering the full range of standard industrial shaft diameters from small conveyor stub shafts to large agitator main shafts.

■ Oil Seal on Both Bore Ends Prevents Contamination

Double-lip oil seals on both sides of the hollow bore prevent lubricant leakage onto the driven shaft and block contaminant ingress into the gear mesh — critical in food processing and chemical environments.

■ Bilateral Solid Input Shaft for Motor Flexibility

While the output is hollow bore, the input remains a standard solid shaft (A-type, input below) with bilateral connection options, maintaining full WPA-series motor mounting compatibility.

⚊ Shaft-Mounted Conveyor Head Drives

The WPKA slides directly onto the conveyor head shaft, eliminating the external coupling and shaft-to-shaft alignment that accounts for 40% of conveyor drive maintenance issues. Torque arm reaction handles the housing restraint.

☵ Agitator & Mixer Drives

Vessel agitator shafts drop straight through the WPKA hollow bore. No external coupling means no coupling lubrication, no coupling alignment, and no coupling fatigue failures in the aggressive chemical mixing environment.

⚒ Rotating Platform & Turntable Drives

The hollow bore allows a central pivot shaft to pass through the gearbox, enabling compact turntable and indexing table designs that would be impossible with a conventional solid-output gearbox.

⚛ Fan & Blower Drives

Industrial fans with long keyed shafts mount directly into the WPKA bore, removing the coupling hub mass from the shaft overhang and improving dynamic balance in high-speed fan applications.

⚔ Bucket Elevator Drives

The WPKA’s shaft-mount configuration is inherently better suited to the sustained radial loads of bucket elevator head drives than solid-output units with external couplings that introduce additional bending moments.

✎ ISO 9001:2000 Certified

We hold ISO 9001:2000 International Quality System Certification — the first in our industry category to achieve this standard. Every WPKA is manufactured, assembled, and tested under this quality framework.

✎ CE Marking

Full CE marking confirms compliance with EU Machinery Directive 2006/42/EC requirements — covering safety, design standards, and manufacturing quality for mechanical power transmission equipment.

✎ Pre-Shipment Testing

Every unit undergoes: Noise test (below 68 dB(A) at rated load), Oil leak test (30-minute pressurisation), and Torque transmission test (output torque within ±5% of rated). Failed units are reworked — not shipped.

✎ FC20+ Material Certification

Housing castings are verified by material test certificates for FC20 grade (220 MPa minimum tensile strength). Hardness testing (160–200 HB) and ultrasonic testing for internal defects are performed on size 135 and above.

“Replaced all our belt conveyor head drives with WPKA shaft-mounted units at our Queensland coal mine. Eliminated coupling failures entirely — we haven’t had a single drive-related unplanned stoppage in two years. The hollow bore installation takes 20 minutes per unit.”

“WPKA gearboxes drive our reactor agitator shafts. The hollow bore goes straight onto the agitator shaft — no coupling exposed to our corrosive process environment. Zero leaks in 36 months of continuous operation in a sulphuric acid atmosphere.”

“We use WPKA-135 units on our bucket elevator head drives. The shaft-mount design reduced the installed height of our elevator head by 180 mm compared to the previous solid-output unit plus coupling arrangement. A significant improvement in building clearance.”

“WPKA drives our steriliser cage conveyor shafts in a very wet and corrosive steam environment. Cast iron durability has outlasted the aluminium hollow-shaft gearboxes we previously used. Only feedback is that we’d appreciate Viton seal option as standard.”