Cleveland Eastern Top Entry Mixers Line Offers Three Series of Gear Reducer Drives:

• XT Series - Worm Gear Design
• HGD Series - All Helical Gear
• BHD Series - Combination Helical Spiral/Bevel Gear Design
  
  

FEATURES & BENEFITS COMMON TO ALL THREE DESIGNS:

• DESIGNED SPECIFICALLY for mixer service
• MEET ISO9001 & AGMA STD. 440, 6010
• MINIMUM SERVICE FACTOR is 1.5
• RUGGED HOUSING withstands the stresses of mixing and maintains accurate component alignment.
• ROLLER BEARINGS Oversized tapered roller bearings rated up to 100,000 hours B-10 life.
• OVERSIZEDOUTPUT SHAFTS protect gears from harmful deflection caused by large overhung loads.
• LUBRICATION Efficient splash oil lubrication is standard. No pumps to fail or maintain. A dip stick is provided for ease of maintenance checks.
• DRYWELL CONSTRUCTION prevents oil leakage down the shaft.
• STANDARD IMPELLERS are the XTF-3 high-efficiency hydrofoil design for high flow at low power consumption. A wide choice of optional impellers designed to meet specific process applications are available.
• MECHANICAL SEALS Mechanical shaft seals are true cartridge designs and are removable without disturbing the drive or shaft/impeller assembly. Vapor seals, low or high pressure stuffing boxes, single or double mechanical seals are optional. Also available is a dry running seal for sanitary applications and a split seal to simplify installation and maintenance.
  
  

COMPARISON SUMMARY OF GEAR REDUCER FEATURES

	XT Series Worm Gear	HGD Series Helical/Helical	BHD Series Helical/Spiral Bevel
Efficiency	65 - 95%	88 - 96%	88 - 96%
Precision of Torque Transfer	High	Moderate	Moderate
Shock Load Capacity	300%	200%	200%
Noise Level	Best	Good	Good
1st Cost/Unit of Torque	Below Average	Average	Above Average
Headroom	Very Low	High	Low
Reduction Ratio Range	Widest	Wide	Wide

ENERGY CONSUMPTION In general, the worm gear will be less efficient, but may  offer lower yearly maintenance. Consider two 5 HP, 84 RPM mixers: a helical/spiral bevel unit with an efficiency of 95% and a worm gear unit with an efficiency of 88%. At full load, the incremental difference in HP draw is 0.35 HP.

Based on the operating cost difference, a plant would need to operate a helical/spiral bevel unit for 10-15 years to offset its high initial cost compared to the worm gear reducer.

XT SERIES

COMPACT DESIGN The smallest envelope drive package available in top-entry mixers requiring less mounting space and reduced weight per HP.

LOWEST HEADROOM for both open and closed tank designs provide ease of installation in tight quarters.

H.P. from .5 to 15 - SPEEDS from 20 to 350 RPM.

HIGH SHOCK/OVERLOAD CAPABILITY

Gear teeth are subjected to a crushing load rather than a bending load. Momentary peak overloads of up to 300% of reducer rating are permissible. Compare this to 200% for other gear types.  This design is a major advantage while starting in settled solids.

SELF-ALIGNING hollow quill output shaft provides maximum protection for drive bearings and gears. No shaft couplings are required allowing ease of installation and lower cost.

LOWER MAINTENANCE COST Fewer moving parts to wear out. Optimum mixing output speeds can be achieved in one stage gearing, resulting in fewer bearings, gears and spare parts. The involute, helicoid gear type has manufacturing repeat-ability, eliminating the need for high priced matched gear sets, and simplifies repair procedures.

QUIET OPERATION A precision ground worm gear provides multiple tooth sliding contact for smooth transmission of power. Eliminates chatter and vibration for exceptionally quiet operation below OSHA db noise specifications.

MOTORS Motors are standard NEMA frame, C-flange mounted. No alignment is necessary. Low AGMA speeds can be reached with standard 1750 or 1150 RPM motors rather than more expensive 850 RPM units.

HGD SERIES

GEAR REDUCERS are double reduction, helical/ helical, with efficiencies of 95-97%.

H.P. ranges from 3 to 20 with 37 to 125 RPM output speeds.

CAST IRON HOUSING withstands the stresses of mixing loads and maintains accurate component alignment.

MOTORS are standard NEMA frame, C-face mounted and flexibly coupled to the reducer input shaft. Expensive 875 RPM motors are not required for low speed applications. 

BHD SERIES

GEARING Combination AGMA Class #10 helical and spiral-bevel gearing for highest drive efficiency. Eight case sizes.

H.P. ranges from 3 to 100.

OUTPUT SPEEDS from 37 to 155 RPM.

RIGHT-ANGLE DRIVE construction provides low headroom.