Page 6 - Parker - Gearheads and Gearmotors

Application Examples

Plastic Bottle Extrusion High Wear and Low Efficiency

The manufacturer of The high level of rubbing (sliding action) between the
high-performance worm and wheel teeth in the worm gearhead caused a
plastic extrusion high gear-tooth-wear rate and a lower efficiency (70%)
equipment needed a than other major gear types.
drop-in replacement Parker SOLUTION:
gearhead for an existing
worm gearbox used Stealth PS Gearhead and RT
with their motor MultiDrive (hollow shaft) Gearhead
without having to were used in combination to provide
alter the design of their machine. The gearhead/motor the required 120:1 ratio. The result
combination is being used to drive the machine’s was high-quality plastics sheets that
rollers, controlling the speed at which the plastic exceeded the customer’s specifications.
is extruded into high-quality plastic sheets. The The Stealth’s all-helical planetary design (HeliCrown
smoothness of the rollers is critical to the quality of the Gear Tooth) features extremely high gear tooth
plastic sheets being produced.
accuracy, minimizing transmission error and
Application Challenges: velocity ripple. The HeliCrown design features
extremely high efficiency (95%) while minimizing
High Transmission Error and Velocity Ripple tooth wear by providing a pure rolling action.
The customer used worm gearheads to control the Parker’s Plasma Nitriding heat-treating process
rollers. Worm gears exhibit a sliding action of involute further heightens the gear tooth’s wear resistance.
gears instead of a rolling action, contributing to the lack The MultiDrive gearhead features a space-saving
of smoothness of the machine rollers. Due to the high bore (hollow shaft) option, eliminating compliance
transmission error and velocity ripple from the worm that occurs when coupling a gearhead shaft to the
drive, the rollers operated at differing speeds. This rollers being driven. This solution can be used for a
produced small lines and imperfections on the plastic variety of applications, including packaging, food,
sheets, rendering it unusable. semiconductor, automotive and medical.

Food/Packaging Automation

A manufacturer • Output Shaft – stainless steel prevents any
of machines for rust from developing and contaminating the
gluing, fill, sealing processing food.
and diverting food
containers for the Parker SOLUTION:
food-processing Stealth PS planetary gearhead with
industry had a standard F01 food grade special option
requirement for the motor and gearhead to
be mounted above the food plane. Certain Stealth PS planetary gearhead with
modifications were also needed for the gearhead to standard food grade option provides
make it safe for the food environment, and capable the gearhead with standard modifications including
to withstand frequent washdowns. special lubrication, viton seals, special finish and a
stainless steel output shaft.
Gearhead Design Considerations:
• Lubrication – must be USDA food grade Since this food grade modification is a standard
approved in case of incidental contact to food option, delivery is only one week over the standard
• Sealing –must prevent any leaking as well as gearhead lead time. (Note: Similar standard
prevent any ingress of the fluid during washdown modifications exist for vacuum, clean room, high
• Finish – special FDA-approved finish must temperature and radiation.)
be used making it very durable and resistant
to chipping, oxidizing or rusting

6 Parker Hannifin Corporation • Electromechanical Automation Division • 800-358-9070 • www.parkermotion.com